#include<bits/stdc++.h>
using namespace std;
int main(){ 
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    int min=a;
    if (min>b){
        min=b;
    }
    if (min>c){
    	min=c;
	}
	if (min>d){
		min=d;
	}
	cout<<min<<endl;
    return 0;
}
/**************************************************************
	Problem: 1708
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/