一本通1032
//qf
#include <bits/stdc++.h>
#define f(i,j,n) for(register int i=j;i<=n;i++)
using namespace std;
typedef long long ll;
inline ll read() {
ll x=0;
int f=1;
char ch=getchar();
while(!isdigit(ch)) {
if(ch=='-') f=-1;
ch=getchar();
}
while(isdigit(ch)) x=(x<<1)+(x<<3)+(ch-48),ch=getchar();
return x*f;
}
const double p=3.14159;
int h=read(),r=read();
signed main() {
double v=p*r*r*h/1000.0;
double water=20.0/v;
cout<<ceil(water)<<endl;
return 0;
}
不存在十全十美的文章 如同不存在彻头彻尾的绝望