#include <bits/stdc++.h>
using namespace std;
int main() {
long long a, b ,c, d;
cin>>a>>b>>c>>d;
if (a>b && a>c && a>d)
cout<<a;
else if (b>a && b>c && b>d)
cout<<b;
else if (c>a && c>b && c>d)
cout<<c;
else
cout<<d;
return 0;
}
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