#include <iostream>
using namespace std;
int main() {
int a, b, c;
cin>>a>>b>>c;
a=a/100+a/10%10+a%10;
b=b/100+b/10%10+b%10;
c=c/100+c/10%10+c%10;
if (a>b) swap (a,b);
if (a>c) swap (a,c);
if (b>c) swap (b,c);
cout<<c;
return 0;
}
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