#include <iostream>
using namespace std;
int main(){
int a,b,c;
cin>>a>>b>>c;
if (a>b && a>c){
cout<<b*c;
}
if (b>c && b>a){
cout<<c*a;
}
if(c>b && c>a){
cout<<b*a;
}
return 0;
}
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