选择题第10题：
cpp
#include <iostream>
using namespace std;
int main()
{
int cnt = 0;
for (int x = 0; x <= 10; x++)
for (int y = 0; y <= 10; y++)
for (int z = 0; z <= 10; z++)
if (x + y + z <= 15)
cnt++;
cout << cnt << endl;
return 0;
}