#include<stdio.h>
int main() {
    int radius, height;
    double surface_area;
    
    if(scanf("%d %d", &radius, &height) != 2) {
        return 1;
    }
    
    if(radius < 0 || height < 0) {
        printf("Invalid Input\n");
        return 1;
    }
    
    surface_area = (2 * PI * radius * height) + (PI * radius * radius);
    
    printf("%.2lf\n", surface_area);
    
    return 0;
}