Go: package main

import (
        "fmt"
)

func main() {
        var n int
        for {
                _, err := fmt.Scanf("%d", &n)
                if err != nil {
                        break
                }
                cnt := 0
                for a := 0; a < 10; a++ {
                        for b := 0; b < 10; b++ {
                                for c := 0; c < 10; c++ {
                                        for d := 0; d < 10; d++ {
                                                if a+b+c+d == n {
                                                        cnt++
                                                }
                                        }
                                }
                        }
                }
                fmt.Printf("%d\n", cnt)
        }
}

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

#define rep(i, n) for (int i = 0; i < int(n); i++)
#define rrep(i, n) for (int i = int(n) - 1; i >= 0; i--)
#define reps(i, n) for (int i = 1; i <= int(n); i++)
#define rreps(i, n) for (int i = int(n); i >= 1; i--)
#define repc(i, n) for (int i = 0; i <= int(n); i++)
#define rrepc(i, n) for (int i = int(n); i >= 0; i--)
#define repi(i, a, b) for (int i = int(a); i < int(b); i++)
#define repic(i, a, b) for (int i = int(a); i <= int(b); i++)
#define each(x, y) for (auto &x : y)
#define all(a) (a).begin(), (a).end()
#define bit(b) (1ll << (b))

using namespace std;

using i32 = int;
using i64 = long long;
using u64 = unsigned long long;
using f80 = long double;
using vi32 = vector<i32>;
using vi64 = vector<i64>;
using vu64 = vector<u64>;
using vf80 = vector<f80>;
using vstr = vector<string>;

inline void yes() { cout << "Yes" << '\n'; exit(0); }
inline void no() { cout << "No" << '\n'; exit(0); }
inline i64 gcd(i64 a, i64 b) { if (min(a, b) == 0) return max(a, b); if (a % b == 0) return b; return gcd(b, a % b); }
inline i64 lcm(i64 a, i64 b) { return a / gcd(a, b) * b; }
inline u64 xorshift() { static u64 x = 88172645463325252ull; x = x ^ (x << 7); return x = x ^ (x >> 9); }
void solve(); int main() { ios::sync_with_stdio(0); cin.tie(0); cout << fixed << setprecision(16); solve(); return 0; }
template <typename T> class pqasc : public priority_queue<T, vector<T>, greater<T>> {};
template <typename T> class pqdesc : public priority_queue<T, vector<T>, less<T>> {};
template <typename T> inline void amax(T &x, T y) { if (x < y) x = y; }
template <typename T> inline void amin(T &x, T y) { if (x > y) x = y; }
template <typename T> inline T power(T x, i64 n, T e = 1) { T r = e; while (n > 0) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; }
template <typename T> istream& operator>>(istream &is, vector<T> &v) { each(x, v) is >> x; return is; }
template <typename T> ostream& operator<<(ostream &os, vector<T> &v) { rep(i, v.size()) { if (i) os << ' '; os << v[i]; } return os; }
template <typename T, typename S> istream& operator>>(istream &is, pair<T, S> &p) { is >> p.first >> p.second; return is; }
template <typename T, typename S> ostream& operator<<(ostream &os, pair<T, S> &p) { os << p.first << ' ' << p.second; return os; }

void solve() {
  int n;
  while (cin >> n) {
    int ans = 0;
    repc(a, 9) repc(b, 9) repc(c, 9) repc(d, 9) {
      if (a + b + c + d == n) ans++;
    }
    cout << ans << '\n';
  }
}

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

int main(){
	int n;
	while(cin >> n){
	int s = 0;
	for(int i = 1 ; i <= 9 ; i++)
	for(int j = 1 ; j <= 9 ; j++)
	for(int k = 1 ; k <= 9 ; k++)
	for(int l = 1 ; l <= 9 ; l++)
		if( i+j+k+l==n)s++;
	cout << s << endl;
	}
}

C++: #include<iostream>
int t[37]={0},i,j,x,a,b;int main(){for(;i++<10000;t[x]++)for(j=x=0,b=i;j++<4;b/=10)x+=b%10;for(;!(std::cin>>a).eof();)printf("%d\n",t[a]);}

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

int main () {

int n, count = 0;

    cout << "Input n: ";
    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 << "Number of solutions: " << count;


    return 0;

}

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

int main(){
int a[5][51];
int b;
int c;
int d;
b=1;
while(b<5){
c=0;
while(c<51){
a[b][c]=0;
c=c+1;}
b=b+1;}

b=0;
while(b<10){
a[1][b]=1;
b=b+1;}

b=2;
while(b<5){
c=0;
while(c<51){
d=0;
while(d<9){
if(c>=d){a[b][c]=a[b][c]+a[b-1][c-d];}
d=d+1;}
c=c+1:}
b=b+1;}
int n;
while(cin >> n){
cout << a[4][n] << endl;}


}

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

int main(){
	
	int n;
	int a, b, c, d;
	int combsum=0;

	while(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 )
							combsum++;

		cout << combsum << endl;
	}
	return 0;
}

C++: include<iostream>
using namespace std;
int main(){
  int n;
  while(cin >>n){
    int solve = 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++)
      if(i+j+k+l==n) solve++;
    cout <<solve<<endl;
  }
  return 0;
}

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

C++: #include <iostream>

using namespace std;

bool calc(int a, int b, int n) {
	n -= a-b;
	for (int c=0; c<10; c++) {
		for (int d=0; d<10; d++) {
			if (n == c+d) return true;
		}
	}
	return false;
}

void solve(int n) {
	int count = 0;
	for (int a=0; a<10; a++) {
		for (int b=0; b<10; b++) {
			if (calc(a,b,n)) count++;
		}
	}
	cout << count << endl;
}

int main() {
	int n;
	while (cin >> n) {
		solve(n);
	}
	return 0;
}

C++: #include <iostream>
#include <cmath>

using namespace std;

int comb(int a,int num){
    if(num == 1){
        return 1;
    }
    else{
        int count = 0;
        for(int i = 0; i <= min(a,9); i++){
            if(a - i <= 9*(num-1)) count = count + comb(a-i, num-1);
        }
        return count;
    }

}

int main(){
    int n,k;
    while(cin >> n){
        cout << comb(n,4) << endl;
    }

}

C++: 
/* vo00_08.cpp */
#include <iostream>
using namespace std;

int main()
{
	int n, count;

	while (true) {
		cin >> n;
		if (cin.eof()) { break; }

		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 (n == a + b + c + d) { count++; }

		cout << count << '\n';

	}
	return 0;
}

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

int main()
{
	int n, iCount;

	cin >> n;

	iCount = 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 )
						iCount++;
				}
			}
		}
	}

	cout << iCount << endl;

	return 0;
}

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

int main()
{
	int num;
	int c = 0;
	while (cin >> num)
	{
		c = 0;
		if (num > 36 || num < 0)
		{
			cout << 0 << endl;
			continue;
		}
		else
		{
			for (int i = 0; i <= 9; i++)
				for (int j = 0; j <= 9; j++)
					for (int k = 0; k <= 9; k++)
						for (int v = 0; v <= 9; v++)
						{
							if (i + j + k + v == num)
								c++;
						}
			cout << c << endl;
		}
	}
	
	return 0;
}

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



int main() {

//変数の宣言

	int nom=0,n,x,i,j,k,l;


/////メイン処理/////

	while(cin>>x){
		
		for(i=0;i<10;i++){
			for(j=0;j<10;j++){
				for(k=0;k<10;k++){
					for(l=0;l<10;l++){
						if (i+j+k+l==x){
							nom++;
							break;
						}
					}
				}
			}
		}
		
		//出力
		cout << nom << endl;
		nom = 0;
	}
	return 0;
}