func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m, a, b, sum = 0;     cin >> n >> m;     for (int i = 0; i < n * m; i++) {       cin >> a >> b;       if (a == 1 || b == 1) sum++;     }     cout << sum;     return 0;   }   