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<iostream>
#include<cmath>
using namespace std;

int main()
{
	int n,a,b,cnt=0;
	cin >> n;
	for(a=0;a<=18;a++){
		for(b=0;b<=18;b++){
			if(a+b==i) cnt+= (10-abs(a-9)) * (10-abs(b-9));
		}
	}
	cout << cnt << endl;
	return 0;	
}

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

int main () {

int n, count = 0;

while(cin >> n){

    for (int a = 0; a < 10 && a <= n; a++){
        for (int b = 0; b < 10 && b <= n-a; b++){
            for (int c = 0; c < 10 && c <= n-a-b; c++){
                if (n-a-b-c >=0 && n-a-b-c < 10) {
                    count++;
                }
            }
        }
    }

}
    cout << count;


    return 0;

}

C++: #include<iostream>

int main(){
	int a,b,c,d,i,n;
	
	i=0;
	while(std::cin>>n){
	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){
						i++;
					}
				}
			}
		}
	}
	std::cout<<i<<std::endl;
		}
	return 0;
}

C++: #include <stdio.h>

int main()
{
	int n,dp[51][4];

	for(int i = 0; i < 51; i++){
		if(i < 10)
			dp[i][0] = 1;
		else
			dp[i][0] = 0;
		dp[i][1] = 0;
		dp[i][2] = 0;
		dp[i][3] = 0;
	}
	for(int i = 0; i < 3; i++){
		for(int j = 0; j <= 50; j++){
			for(int c = 0; c < 10; c++){
				if(j+c <= 50)
					dp[j+c][i+1] += dp[j][i];
			}
		}
	}
	for(int i = 0; i < 4; i++){
		for(int j = 0; j < 51; j++){
			printf("%d ",dp[j][i]);
		}
		printf("\n");
	}

	while(scanf("%d",&n) != EOF){
		printf("%d\n",dp[n][3]);
	}

	return 0;
}

C++: #include <iostream>

using namespace std;

int digits_sum(int num) {
    int digit, sum = 0, base = 1000;
    
    while(base != 0) {
        digit = num / base;
        sum += digit;
        num -= base * digit;
        base /= 10;
    }
    
    return sum;
}

int main() {
    int n, res, cnt;
    
    while(cin >> n) {
        cnt = 0;
        
        for(int i = 0;i < 10000;i++) {
            res = digits_sum(i);
            
            if(res == n) {
                cnt++;
            }
        }
        
        cout << cnt << endl;
    }
    
    return 0;
}

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

int solve(){
    int 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){
                    int tmp = i + j + k + l;
                    if(tmp == N) ans++;
                }
            }
        }
    }
    return ans;
}

int main(){
    cin >> N;
    int ans = solve();
    cout << ans << endl;
}

C++: #include<iostream>

using namespace std;

int main(){
	int n, ans;
	int counter = 0;
	while (cin >> n){
		for (int i = 0; i < 10; i++){
			for (int q = 0; q < 10; q++){
				for (int w = 0; w < 10; w++){
					for (int e = 0; e < 10; e++){
						ans = i + q + w + e;
						if (ans == n){
							counter += 1;
						}
					}
				}
			}
		}
		cout << counter << endl;
	}
}

C++: #include <bits/stdc++.h>
//#include "bits/stdc++.h"

#define rep(i,n) for(ll (i)=0;(i)<(ll)(n);(i)++)
#define all(x) (x).begin(),(x).end()
#define MOD 1000000007LL
#define INF (1LL<<60LL)
#define int long long
typedef long long ll;

using namespace std;



signed main() {
	ll n;
	while (cin >> n) {
		ll ans = 0;
		for(ll i = 0 ;i<10;i++)
			for (ll j = 0; j < 10; j++)
				for (ll k = 0; k < 10; k++) {
					ll d = n - i - j - k;
					if (0 <= d && d < 10) ans++;
				}
		cout << ans << endl;
	}
}

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

int main(){
  int s,h = 0;
  int n,t = 0;
  cin>>n>>t;

  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){
     s++;
   }else if(a+b+c+d ==t){
     h++;
   }
 }
 }
 }
  }
  cout<<s<<endl;
  cout<<h<<endl;

  return 0;
}

C++: #include<iostream>
#include<cstdio>
using namespace std;
int main(){
  int n,cont;
  while(scanf("%d",&n)!=EOF){
    cont=0;
    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++){
	    cout<<i<<" "<<j<<" "<<k<<" "<<l<<endl;
	    if(i+j+k+l==n)cont++;
	  }
	}
      }
    }
    cout<<cont<<endl;
  }
}

C++: #include <iostream>

using namespace std;
 
int main(int argc, char** argv) {
    int n;
    while(cin >> n) {
        int count = 0;
        for(int a=0; a<=9; a++) {
            for(int b=0; b<=9; b++) {
                for(int c=0; c<=9; c++) {
                    for(int d=0; d<=9; d++) {
                        if(a+b+c+d == n) {
                            count++;
                        }
                    }
                }
            }
        }
        cout << count << endl;
    }
    return 0;
}

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

int main(){
	int n,num = 0;
	while(cin >> n){
		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){
							++num;
							break;
						}
					}
				}
			}
		}
	cout << num << '\n';
	}
	return 0;
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
int a[50];
int b[50];
int main(){
	for (int x = 0; x < 50; x++){
		cin >> a[x];
		while (cin >> a[x])


			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 ==a[x] ){
								b[x]++;
							}
						}
					}
				}
			}
	}
	for(int x=0;x<50;x++)
{
cout << b[x] << endl;
}

	return 0;
}

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

int main(){
    int i,j,k,l;
    
    int ans = 0;
    
    int n;

    while(cin >> n){
        ans = 0;
    
        for(i=0;i<10;i++){
        
            if(i>n)break;
            for(j=0;j<10;j++){
                    
                    for(k=0;k<10;k++){
                        for(l=0;l<10;l++){
                            if((i+j+k+l)==n){
                                    ans++;
                            }
                        }
                    }
            }
        }
cout << ans << endl;
    }
    
    

    return 0;
}

C++: #include <stdio.h>
#include <iostream>
#define rep(i,n) for(int i = 0; i < (n); ++i)
using namespace std;
int n;
int main() {
	int a, b, c, d;
	while(scanf("%d\n", &n) != EOF) {
		int count = 0;
		rep(a,10) {
			rep(b,10) {
				rep(c,10) {
					rep(d,10) {
						if(a + b + c + d == n) count++;
					}
				}
			}
		}
		cout << count << endl;
	}
	return 0;
}