#include <bits/stdc++.h>   using namespace std;   void RI() {}   template <typename... T>   void RI(int& head, T&... tail) {     scanf( %d , &head);     RI(tail...);   }   void RLL() {}   template <typename... T>   void RLL(long long& head, T&... tail) {     scanf( %lld , &head);     RLL(tail...);   }   void print() { putchar(  n ); }   template <typename T, typename... U>   void print(T head, U... tail) {     cout << head <<    ;     print(tail...);   }   const int MOD = 1000000007;   int main() {     int k, ans = 0;     RI(k);     for (int i = 0; i < (int)(k); i++) {       int r;       RI(r);       ans = max(ans, r - 25);     }     printf( %d n , ans);     return 0;   }   