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#include <bits/stdc++.h>
using namespace std;
int main(){
double r,PI=3.14159;
cin >> r;
double d,c,s;
d=2r;
c=2PIr;
s=PIr*r;
printf("%.4f",d);
printf(" ");
printf("%.4f",c);
printf(" ");
printf("%.4f",s);
return 0;
}