Write a program which reads an integer n and identifies the number of combinations of a, b, c and d (0 ≤ a, b, c, d ≤ 9) which meet the following equality:
a + b + c + d = n
For example, for n = 35, we have 4 different combinations of (a, b, c, d): (8, 9, 9, 9), (9, 8, 9, 9), (9, 9, 8, 9), and (9, 9, 9, 8).
Input
The input consists of several datasets. Each dataset consists of n (1 ≤ n ≤ 50) in a line. The number of datasets is less than or equal to 50.
Output
Print the number of combination in a line.
Sample Input
35
1
Output for the Sample Input
4
4思路：直接暴力解决；
#include<iostream>
#include<algorithm>
#include<cstring>
using namespace std;
int main(){int n,ans;while(~scanf("%d",&n)){ans=0;for(int i=0;i<=9;i++)for(int j=0;j<=9;j++)for(int k=0;k<=9;k++)for(int l=0;l<=9;l++)if(i+j+k+l==n)ans++;printf("%d\n",ans);}
}