#include <bits/stdc++.h>   using namespace std;   int n, b, g, ans;   int main() {     scanf( %d%d%d , &b, &g, &n);     for (register int i = 0; i <= n; ++i) {       register int a = i, f = n - i;       if (a <= b && f <= g) ++ans;     }     printf( %d n , ans);     return 0;   }   