题解

可改变量名! 求赞

#include <bits/stdc++.h>
using namespace std;
const double pi=3.14159;
int main(){
	double a,b;
	cin>>a>>b;
	int w = 20000;
	double v = pi * b * b * a;
	double f = w / v;
	cout<<ceil(f);
	return 0;
}