#include<stdio.h>
#define Pi 3.141592657

int input(int r);
int s, r, a = 0, b = 0, c = 0;

int main(int s)
{
	s = (int)Pi*input(r) ^ 2;
	printf("三维体的二维圆面转换值为:%d\n", s);
	return s;
}

int input(int r)
{
	printf("输入空间的长宽高(整数),以空格隔开。\n");
	scanf_s("%d %d %d", &a, &b, &c);
	r = a*b*c;
	return r;
}