#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,d,e;
    cin>>a>>b>>c>>d>>e;
    int max=a;
    if (max<b){
    	max=b;
	}
	if (max<c){
    	max=c;
	}
	if (max<d){
    	max=d;
	}
	if (max<e){
    	max=e;
	}
	cout<<max<<endl;
}
/**************************************************************
	Problem: 1736
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/