/******************************************************************************
Online C++ Compiler.
Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.
*******************************************************************************/
#include <iostream>
using namespace std;
int main()
{
int d = 0;
cout << "Enter d: ";
cin >> d;
int num = 0;
for (int i = 1; i <= 20; ++i)
for (int j = 1; j <= 20; ++j)
for (int k = 1; k <= 30; ++ k)
if (i + j + k < d)
++num;
cout << endl << "num = " << num << endl << "P[D = " << d << "] = " << std::fixed << num * 100.0 / 12000 << "%";
return 0;
}
