Go: package main
import (
	"fmt"
	"os"
	"strconv"
	"bufio"
)

var sc = bufio.NewScanner(os.Stdin)

func main(){
	for sc.Scan(){
		n := nextInt()
		cnt := 0
		// 37以上のとき組み合わせは存在しないが省くのめんどくさいのでまとめて計算
		for a:=0; a<=9; a++{
			for b:=0; b<=9; b++{
				for c:=0; c<=9; c++{
					for d:=0; d<=9; d++{
						if a+b+c+d==n{
							cnt++
						}
					}
				}
			}
		}
		fmt.Println(cnt)
	}
}

func next()string{
	//sc.Scan()
	return sc.Text()
}

func nextInt()int{
	a, _ := strconv.Atoi(next())
	return a
}

C++: #include <algorithm>
#include <iostream>
#include <vector>

namespace {

int combination(int a, int b, int c, int d)
{
  // (a,a,a,a)
  if (a == d) {
    return 1;
  }
  // (a,a,a,d) or (a,b,b,b)
  else if (a == c || b == d) {
    return 4;
  }
  // (a,a,c,c)
  else if (a == b && c == d) {
    return 6;
  }
  // (a,a,c,d) or (a,b,b,d) or (a,b,c,c)
  else if (a == b || b == c || c == d) {
    return 12;
  }
  // (a,b,c,d)
  else {
    return 24;
  }
}

int calc(int n)
{
  int com = 0;
  int a, b, c, d;

  for (a = 0; a <= 9; ++a) {
    if (a > n) break;
    for (b = a; b <= 9; ++b) {
      if (a + b > n) break;
      for (c = b; c <= 9; ++c) {
        if (a + b + c > n) break;
        for (d = c; d <= 9; ++d) {
          const int sum = a + b + c + d;
          if (sum == n) {
            com += combination(a, b, c, d);
          }
          else if (sum > n) {
            break;
          }
        }
      }
    }
  }

  return com;
}

} // unnamed namespace

int main()
{
  int n;
  while (std::cin >> n) {
    std::cout << calc(n) << std::endl;
  }

  return 0;
}

C++: #include<iostream>
using namespace std;

int main(){
  int n;
  while(cin >> n){
    int cnt;
    for(int a = 0; a < 10; a++){
      for(int b = 0; b < 10; b++){
        for(int c = 0; c < 10; c++){
          for(int d = 0; d < 10; d++){
            if(a + b + c + d == n)
             cnt++;
          }
        }
      }
    }
    cout << cnt << endl;
  }

}

C++: #include <iostream>
#include <vector>
using namespace std;

int count = 0;
void dfs(int num, int tempsum, int sum) {
	if (sum < tempsum)
		return;
	if (num == 4) {
		if (tempsum == sum) {
			count++;
		}
		return;
	}

	for (int i = 9; i >= 0; i--) {
		dfs(num+1,tempsum + i,sum);
	}
}  

int main()  
{  
	int iSum = 0;
	while (cin >> iSum) {
		count = 0;
		dfs(0,0,iSum);
		cout << count << endl;
	}

	return 0;
}

C++: #include<iostream>

using namespace std;

int main(){
	int n, count=0;
	cin >> n;
	for(int i=0;i<10;++i){
		for(int j=0;j<10;++j){
			for(int k=0;k<10;++k){
				for(int l=0;l<10;++l){
					if(i+j+k+l == n) count++;
				}
			}
		}
	}
	cout << count;
	return 0;
}

C++: 
#include <iostream>

using namespace std;

int main() {
    int n;
    while(cin >> n) {
        int cnt = 0;
        for(int i = 0; i <= 9; ++i)
            for(int j = 0; i <= 9; ++j)
                for(int k = 0; k <= 9; ++k)
                    for(int l = 0; l <= 9; ++l)
                        if(i+j+k+l == n) ++cnt;
        cout << cnt << endl;
    }
    return 0;
}

C++: #include<stdio.h>

int main(){

int num,i,j,a,b,c,d;
int date[51]={0};


for(i=0;i<=9999;i++){
	
	a=i/1000;
	b=i%1000/100;
	c=i%100/10;
	d=i%10;
	date[a+b+c+d]++;

}


while(scanf("%d",&num)!=EOF){



printf("%d\n",date[num]);
}
return 0;
}

C++: #include<iostream>
using namespace std;
int x,ans;
int main(){
while(1){
ans=0;
cin>>x;
if(x<0)return 0;
for(int i=0;i<10;i++){
for(int j=0;i<10;j++){
for(int k=0;k<10;k++){
if(x-(i+j+k)<10){
ans++;
}
}
}
}
cout<<ans;
}
}