diff --git a/src/main.rs b/src/main.rs
index 40a6225..6b60f9a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,81 +2,27 @@ use std::cmp::max;
 
 struct Solution;
 impl Solution {
-    pub fn max_free_time(event_time: i32, start_time: Vec<i32>, end_time: Vec<i32>) -> i32 {
-        let mut first_selection = 0;
-        let mut second_selection = 0;
-        let mut third_selection = 0;
-
-        if end_time[end_time.len() - 1] < event_time {
-            first_selection = event_time - end_time[end_time.len() - 1];
+    pub fn count_days(mut days: i32, mut meetings: Vec<Vec<i32>>) -> i32 {
+        meetings.sort_by(|a, b| a[0].cmp(&b[0]));
+        let mut ans = 0;
+        let mut last_end = 1;
+        for c in meetings.iter() {
+            if last_end >= c[0] {
+                last_end = max(last_end, c[1] + 1);
+                continue;
+            }
+            ans += c[0] - last_end;
+            last_end = c[1] + 1;
         }
-        let mut last_time = 0;
-        for i in 0..start_time.len() {
-            if start_time[i] > last_time {
-                let val = start_time[i] - last_time;
-                if val > first_selection {
-                    third_selection = second_selection;
-                    second_selection = first_selection;
-                    first_selection = val;
-                } else if val > second_selection {
-                    third_selection = second_selection;
-                    second_selection = val;
-                } else if val > third_selection {
-                    third_selection = val;
-                }
-            }
-            last_time = end_time[i];
-        }
-
-        let check_can_add = |left_space: i32, right_space: i32, needed: i32| -> bool {
-            if needed <= third_selection {
-                return true;
-            }
-            if needed <= second_selection {
-                if left_space  == second_selection && right_space == first_selection ||
-                    left_space == first_selection && right_space == second_selection {
-                    return false;
-                }
-                return true;
-            }
-            if needed <= first_selection {
-                if left_space != first_selection && right_space != first_selection {
-                    return true;
-                }
-            }
-            return false;
-        };
-        last_time = end_time[0];
-        let mut last = start_time[0];
-        let mut ans = start_time[0];
-        for i in 1..start_time.len() {
-            let left_space = last;
-            let right_space = start_time[i] - last_time;
-            let new_val = if check_can_add(left_space, right_space, end_time[i - 1] - start_time[i - 1]) {
-                left_space + right_space + end_time[i - 1] - start_time[i - 1]
-            } else {
-                left_space + right_space
-            };
-            ans = max(ans, new_val);
-            last = right_space;
-            last_time = end_time[i];
-        }
-        {
-            let left_space = last;
-            let right_space = event_time - last_time;
-            let new_val = if check_can_add(left_space, right_space, end_time[end_time.len() - 1] - start_time[end_time.len() - 1]) {
-                left_space + right_space + end_time[end_time.len() - 1]
-                    - start_time[end_time.len() - 1]
-            } else {
-                left_space + right_space
-            };
-            ans = max(ans, new_val);
+        days += 1;
+        if days > last_end {
+            ans += days - last_end;
         }
         ans
     }
 }
 
 fn main() {
-    let sl = Solution::max_free_time(5, vec![1, 3], vec![2, 5]);
+    let sl = Solution::count_days(10, vec![vec![5, 7], vec![1, 3], vec![9, 10]]);
     println!("{}", sl);
 }