#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: tonghuawei
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/