#include <iostream>
#include <cmath>
using namespace std;
// 计算舍罕王共需要多少立方的麦子赏赐他的宰相
double WheatNum ()
{
double sum = 0, m3;
for (int i = 0; i < 64; i++)
{
sum = sum + pow(2,i);
}
m3 = sum / (1.42 * pow(10,8));
return m3;
}
int main()
{
cout << WheatNum () << "立方米麦子。" << endl;
}