func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mxN = 302;   bool ar[mxN];   int p, n;   void solve() {     cin >> p >> n;     for (int i = 0; i < n; i++) {       int a;       cin >> a;       int temp = a % p;       if (ar[temp] == 0) {         ar[temp] = 1;       } else {         cout << i + 1;         return;       }     }     cout << -1;   }   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     int t = 1, i = 1;     while (t--) {       solve();     }     return 0;   }   