func_code_string: #include <bits/stdc++.h>   using namespace std;   inline int max2(int a, int b) { return ((a > b) ? a : b); }   inline int min2(int a, int b) { return a < b ? a : b; }   inline int max3(int a, int b, int c) { return max2(a, max2(b, c)); }   long long int gcd(long long int a, long long int b) {     while (b) {       long long int temp = a;       a = b;       b = temp % b;     }     return a;   }   int main() {     int n, w, k;     scanf( %d , &k);     scanf( %d , &n);     scanf( %d , &w);     int total = w * (w + 1);     total = total / 2;     total = total * k;     int diff = total - n;     if (diff > 0)       printf( %d n , diff);     else       printf( %d n , 0);     return 0;   }   