#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	int a,b,c,d;
	cin>>a>>b>>c>>d;
	if(a<b){
		cout<<a;
	}else if(b<c){
		cout<<b;
	}else if(c<d){
		cout<<c;
	}else if(b<c){
		cout<<b;
	}else if(b<d){
		cout<<b;
	}else if(a<c){
		cout<<a;
	}else if(a<d){
		cout<<d;
	}
	return 0;
}
/**************************************************************
	Problem: 1708
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/