#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,d;
    scanf("%d %d %d %d",&a,&b,&c,&d);
    if(b>a){
        swap(b,a);
    }
    if(c>a){
        swap(c,a);
    }
    if(d>a){
        swap(d,a);
    }
    if(c>b){
        swap(c,b);
    }
    if(d>b){
        swap(d,b);
    }
    if(d>c){
        swap(d,c);
    }
    cout<<a;
     
}
/**************************************************************
	Problem: 1035
	User: zhangyilei
	Language: C++
	Result: Wrong Answer
****************************************************************/