排队领水 C++
#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
using namespace std;
int main(){
int n, a, b, cnt = 0;
cin >> n >> a >> b;
for(int i = 1; i <= n; ++i){
if(i > a && i >= n - b) ++cnt;
}
cout << cnt;
return 0;
}
