#include <bits/stdc++.h>
#define rep(i,n) for (int i =0;i < (n); ++i)
using namespace std;
typedef long long ll;

int main() {
    int a,b,c;
    cin>>a>>b>>c;
    int ans=c;
    if (1<=a && a<=c) {
        ans--;
    }
    if (1<=b && b<=c) {
        ans--;
    }
    cout<<ans<<endl;
    return 0;
}