#include <stdio.h>
#define PI 3.14159
 
// 円錐の体積を計算する関数
double cone_volume(double radius, double height) {
    return (1.0 / 3.0) * PI * radius * radius * height;
}
 
int main() {
    double r, h;
 
    // 半径と高さの入力を促す
    printf("r");
    scanf("%lf", &r);
    printf("h");
    scanf("%lf", &h);
 
    // 体積を計算し、表示
    double volume = cone_volume(r, h);
    printf("円錐の体積は %.2f です\n", volume);
 
    return 0;
}
 

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