Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var scanner = bufio.NewScanner(os.Stdin)

func nextString() string {
	scanner.Scan()
	return scanner.Text()
}

func nextInt() (int, error) {
	return strconv.Atoi(nextString())
}

func main() {
	scanner.Split(bufio.ScanWords)

	counts := map[int]int{}
	for i := 0; i < 10; i++ {
		for j := 0; j < 10; j++ {
			for k := 0; k < 10; k++ {
				for l := 0; l < 10; l++ {
					s := i + j + k + l
					if s <= 50 {
						counts[s]++
					}
				}
			}
		}
	}
	// fmt.Println(counts)
	for {
		n, err := nextInt()
		if err != nil {
			break
		}
		cnt, ok := counts[n]
		if ok {
			fmt.Println(cnt)
		} else {
			fmt.Println(0)
		}
	}
}

C++: #pragma GCC optimize "O3"
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#define whole(f,x,...) ([&](decltype((x)) whole) { return (f)(begin(whole), end(whole), ## __VA_ARGS__); })(x)
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define REP_FROM(i,m,n) for (int i = (m); (i) < int(n); ++(i))
#define REP_REV(i,n) for (int i = (n)-1; (i) >= 0; --(i))
#define REP_FROMREV(i,m,n) for (int i = (n)-1; (i) >= int(m); --(i))
#define CLR(a) memset((a), 0 ,sizeof(a))
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
#ifndef LOCAL
#define cerr if (false) cerr
#endif
using namespace std;
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}
template<class T> inline T sqr(T x) {return x*x;}
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;

template <class T> inline void setmax(T & a, T const & b) { a = max(a, b); }
template <class T> inline void setmin(T & a, T const & b) { a = min(a, b); }
template <class T> T sq(T x) { return x * x; }
template <class T> T clamp(T a, T l, T r) { return min(max(a, l), r); } // [l, r]
const double EPS = 1e-10;
const double PI  = acos(-1.0);

int solve(int n) {
	int cnt = 0;
	REP(a, 10)
		REP(b, 10)
			REP(c, 10)
				REP(d, 10)
					if(a+b+c+d == n)
						cnt++;
	return cnt;
}

int main(int argc, char *argv[]) {
	// Something to do
	int n;
	while(cin >> n) {
		cout << solve(n) << endl;
	}
	return 0;
}

C++: #include<stdio.h>
#include<string.h>
int main(void) {
	int  n, count = 0;
		while (scanf("%d", &n) != EOF){
		for (size_t a = 0; a <= 9; a++)
		{
			for (size_t b = 0; b <= 9; b++)
			{
				for (size_t c = 0; c <= 9; c++)
				{
					for (size_t d = 0; d <= 9; d++)
					{
						if (a + b + c + d==n)
						{
							count++;
						}
					}
				}
			}
		}
		printf("%d\n", count);
		count = 0;
	}
	return 0;
}

C++: #include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <algorithm>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <cmath>
#include <cassert>

using namespace std;


#define all(c) ((c).begin()), ((c).end())
#define debug(c) cerr << "> " << #c << " = " << (c) << endl;
#define iter(c) __typeof((c).begin())
#define tr(i, c) for (iter(c) i = (c).begin(); i != (c).end(); i++)
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define REP(i, a, b) for (int i = (int)(a); i <= (int)(b); i++)

#define mp make_pair
#define fst first
#define snd second
#define pb push_back


const double EPS = 1e-10;


typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef complex<double> P;



int main(){
	for (int n; cin >> n; ) {
		int ans = 0;
		rep(a, 10) rep(b, 10) rep(c, 10) rep(d, 10) if(a + b + c + d == n) ans++;
		cout << ans << endl;
	}
	return 0;
}

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

using namespace std;

#define LOG(...) fprintf(stderr, __VA_ARGS__)
//#define LOG(...)
#define FOR(i, a, b) for(int i=(int)(a); i<(int)(b); ++i)
#define REP(i, n) for(int i=0; i<(int)(n); ++i)
#define ALL(a) (a).begin(), (a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define EXIST(s, e) ((s).find(e)!=(s).end())
#define SORT(c) sort(ALL(c))
#define RSORT(c) sort(RALL(c))
#define SQ(n) (n) * (n)

typedef long long ll;
typedef unsigned long long ull;
typedef vector<bool> vb;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<vb> vvb;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

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

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

int task(int n){
  int sum=0;
  if(n>36) return 0; if(n==36) return 1;

  for(int a=0;a<10;a++){
    if(n>(a+9+9+9)) continue;
    for(int b=0;b<10;b++){
      if(n>(a+b+9+9)) continue;
      for(int c=0;c<10;c++){
        if(n>(a+b+c+9))continue;
        for(int d=0;d<10;d++){
          if(n==(a+b+c+d)) sum++;
        }
      }
    }
  }
  return sum;
}

int main(){
  int n;
  while(cin>>n){
    int sum=0;
    sum=task(n);
    cout<<sum<<"\n";
  }
}

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

using namespace std;

int main()
{
	int n, a, b, c, d;
	int  ans;

	while(cin >> n)
	{
		ans = 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)
									ans ++;
							}
					}
			}
	}
		cout << ans << endl;
	
	}

	return 0;
}

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

int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  int i, j, k, l, sum, count = 0;

  while (cin >> sum) {
    count = 0;
    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 == sum) { count += 1; }
          }
        }
      }
    }
    cout << count << endl;
  }

  return 0;
}

C++: #include<stdio.h>
#include<string.h>
int main(){
	int n,r,a,b,c,d;
	while(scanf("%d",&n)!=EOF){
		r=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){
							r++;
						}
					}
				}
			}
		}
		printf("%d\n",r);
	}
	return 0;
}

C++: #include <stdio.h>
#include <algorithm>

using namespace std;
int main(void)
{
	int i, j, k, h, n;
	int sum = 0;
	
	scanf("%d", &n);
	
	for (i = 0; i < 10; i++){
		for (j = 0; j < 10; j++){
			for (k = 0; k < 10; k++){
				for (h = 0; h < 10; h++){
					if (i + j + k + h == n){
						sum++;
					}
				}
			}
		}
	}
	
	printf("%d\n", sum);
	
	return (0);
}

C++: #include<iostream>
using namespace std;
int main(int argc, char const *argv[])
{
	int a;
	while (cin>>a)
	{
		int ans =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 == a) ans++;
					
			
			
		
	}
	cout<<ans;
	return 0;
}