Codeforces Round #432 (Div. 2, based on IndiaHacks Final Round 2017) A. Arpa and a research in Mexican wave

题意：给出n,k,t

其实题意和怎么写都在这张图里

#include<bits/stdc++.h>
using namespace std;

int main(){
    int n,k,t;
    cin>>n>>k>>t;
    if(t<=k){
        cout<<t<<endl;
    }
    else if(t>=n){
        cout<<max(0,k-(t-n))<<endl;
    }
    else cout<<k<<endl;
}