#include <bits/stdc++.h>   using namespace std;   void solve() {     int n;     cin >> n;     int arr[n];     for (int i = 0; i < n; i++) cin >> arr[i];     int ans = 0;     while (1) {       int maxi = 0;       for (int i = 0; i < n; i++) {         if (arr[i] >= arr[maxi]) maxi = i;       }       if (maxi == 0) break;       ans++;       arr[0]++;       arr[maxi]--;     }     cout << ans <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     int t;     t = 1;     while (t--) solve();   }   