#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,s,d,f;
	cin>>a>>s>>d>>f;
	if(a>s){
		swap(a,s);
	}
	if(a>d){
		swap(a,d);
	}
	if(a>f){
		swap(a,f);
	}cout<<a;
}

/**************************************************************
	Problem: 1708
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/