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

/**************************************************************
	Problem: 1305
	User: toughuatao1
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/