func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 100 + 10;   const int INF = int(1e9);   int main() {     int n;     char str1[maxn], str2[maxn];     while (~scanf( %d , &n)) {       scanf( %s %s , str1, str2);       int h, m;       h = (str1[0] -  0 ) * 10 + str1[1] -  0 ;       m = (str2[0] -  0 ) * 10 + str2[1] -  0 ;       int ans = 0;       while (h % 10 != 7 && m % 10 != 7) {         if (m - n < 0) {           m = m - n + 60;           if (h == 0)             h = 23;           else             h--;         } else           m = m - n;         ans++;       }       printf( %d n , ans);     }     return 0;   }   