MAXLN

MAXLN


#include<iostream>
using namespace std;

int main(){
    int T,r;
    long long s;
   
    scanf("%d",&T);
   
    for(int tc = 1;tc <= T;++tc){
        scanf("%d",&r);
       
        s = 4*(long long)r * r;
        printf("Case %d: %lld",tc,s);
        puts(".25");
    }
   
    return 0;
}

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