#include<bits/stdc++.h>
using namespace std;
int main(){
    int v,l,k,o;
    cin>>v>>l>>k>>o;
    if(l>v){
        swap(l,v);
    }
    if(k>v){
        swap(k,v);
    }
    if(o>v){
        swap(o,v);
    }
    cout<<v;
}
/**************************************************************
	Problem: 1305
	User: zhangyilei
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/