小X与三角形

include <bits/stdc++.h>

using namespace std;
int main()
{
int a, b, n=0;
cin >> a >> b;
for (int i=max(a, b)-min(a, b)+1;i<a+b;i++)//1
{
if (a+b>i) n++;
}
cout << n;
}
//1：循环判断条件要注意