func_code_string: #include <bits/stdc++.h>   int main() {     long int n, m;     int t;     scanf( %d , &t);     while (t--) {       scanf( %ld%ld , &n, &m);       if (n == 1)         printf( 0 n );       else if (n == 2) {         printf( %ld n , m);       } else {         printf( %ld n , 2 * m);       }     }     return 0;   }   