#include<stdio.h>
int main()
{
    int r, h;
    double s;
    double pi = 3.1415926;
    if(scanf(%d, &r)!=1 || scanf("%d", &h))!=1){
        
    printf("Invalid input\n");
    return 0;
}
if(r<0 || h<0){
    printf("Invalid input\n");
    return 0;
}
s=2*pi*r*(r+h);
printf("Surface Area: %.2f",s);
return 0;
}