Go: package main

import "fmt"

func main() {
	var i int64
	var list = []int64{13, 19, 109, 199, 829, 1489, 1879, 2089, 3259, 3469, 5659, 9439, 13009, 15649, 15739, 16069, 18049, 18919, 19429, 21019, 22279, 25309, 31729, 34849, 43789, 51349, 55339, 62989, 67219, 69499, 72229, 77269, 79699, 81049, 82729, 88819, 97849, 99139, 101119, 109849, 116539, 119299, 122209, 135469, 144169, 157279, 165709, 166849, 171169, 187639, 194869, 195739, 201499, 201829, 217369, 225349, 240049, 243709, 247609, 247999, 257869, 260419, 266689, 268819, 276049, 284749, 285289, 294319, 295879, 299479, 300499, 301999, 326149, 334429, 340939, 346399, 347989, 354259, 358909, 361219, 375259, 388699, 389569, 392269, 394819, 397549, 397759, 402139, 402769, 412039, 419059, 420859, 427249, 442579, 444349, 452539, 463459, 465169, 467479, 470089, 477019, 490579, 495619, 500239, 510619, 518809, 536449, 536779, 539509, 549169, 559219, 563419, 570049, 572659, 585919, 594829, 597679, 607309, 622249, 626629, 632089, 632329, 633469, 633799, 654169, 657499, 661099, 663589, 664669, 666439, 680299, 681259, 691729, 705169, 715159, 734479, 736369, 739399, 768199, 773029, 795799, 803449, 814069, 822169, 823729, 829729, 833719, 837079, 845989, 854929, 855739, 857959, 875269, 876019, 881479, 889879, 907399, 930079, 938059, 946669, 954979, 958549, 959479, 976309, 978079, 983449, 1002349, 1003369, 1006309, 1006339, 1008859, 1015369, 1022389, 1022509, 1023949, 1027759, 1043599, 1063969, 1065019, 1068259, 1068709, 1091269, 1093069, 1093999, 1100839, 1117609, 1117819, 1118869, 1120549, 1121839, 1122139, 1126669, 1137889, 1146799, 1155619, 1156039, 1157839, 1163719, 1167709, 1168249, 1170139, 1172029, 1172539, 1173589, 1182289, 1210879, 1228399, 1230379, 1233439, 1246249, 1246369, 1257079, 1272289, 1285519, 1298119, 1322179, 1322599, 1324579, 1329709, 1337269, 1339909, 1340329, 1351249, 1352209, 1358809, 1360789, 1368469, 1381279, 1400809, 1402369, 1410979, 1440589, 1447009, 1451839, 1461409, 1468639, 1508629, 1514329, 1524079, 1525969, 1540969, 1571749, 1573549, 1573939, 1577299, 1584439, 1588759, 1592869, 1603339, 1615849, 1616809, 1621729, 1627609, 1631059, 1653109, 1659109, 1670569, 1678759, 1681879, 1685449, 1691869, 1711819, 1718869, 1727779, 1747729, 1748479, 1749499, 1755829, 1764229, 1780489, 1791739, 1797379, 1798639, 1802659, 1819849, 1830349, 1833529, 1834039, 1837399, 1857679, 1890529, 1902619, 1904479, 1910269, 1912069, 1912459, 1915939, 1917739, 1925389, 1943659, 1954159, 1954369, 1959319, 1979149, 1979899, 2002339, 2007619, 2007919, 2016409, 2020729, 2050339, 2062009, 2063779, 2065579, 2075839, 2079199, 2083519, 2084449, 2087389, 2107669, 2116579, 2136139, 2141809, 2143489, 2144509, 2157739, 2159239, 2168659, 2176639, 2177509, 2193889, 2202799, 2203969, 2223679, 2225059, 2246149, 2248249, 2256349, 2262979, 2266639, 2289649, 2290039, 2294059, 2303599, 2340259, 2342779, 2362279, 2373409, 2376169, 2381089, 2403889, 2413429, 2418679, 2423419, 2443789, 2458669, 2470339, 2478529, 2479669, 2499949, 2508049, 2535109, 2541949, 2546239, 2552119, 2552659, 2561269, 2564329, 2576599, 2594959, 2594989, 2596669, 2604739, 2614069, 2635489, 2668249, 2673529, 2674549, 2679499, 2683789, 2696929, 2704909, 2712379, 2715289, 2728549, 2731699, 2731909, 2759299, 2761729, 2764129, 2790259, 2805169, 2822719, 2839939, 2840269, 2846869, 2849689, 2875339, 2879299, 2893489, 2918569, 2927599, 2927809, 2952799, 2954689, 2989039, 2990839, 3047419, 3058879, 3062209, 3063499, 3066829, 3076399, 3089329, 3092569, 3101479, 3103279, 3129619, 3153589, 3157579, 3171739, 3187609, 3200209, 3207439, 3208819, 3215749, 3224869, 3243349, 3277699, 3295549, 3308959, 3326629, 3328909, 3340879, 3366829, 3371449, 3374479, 3378049, 3400219, 3416059, 3436249, 3437719, 3467539, 3479899, 3512059, 3512239, 3512989, 3513079, 3514549, 3518329, 3550699, 3584929, 3586909, 3593509, 3621469, 3652939, 3669769, 3690529, 3713449, 3727729, 3735169, 3741169, 3798079, 3817819, 3837139, 3837859, 3849829, 3854119, 3894049, 3919219, 3919

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

using namespace std;

vector<bool> dp, searched;

bool isprime(int n, int k);

bool is_prime(int n)
{
	if (searched[n])
	{
		return dp[n];
	}

	if (n % 2 == 0)
	{
		return false;
	}

	return isprime(n, 3);
}

bool isprime(int n, int k)
{
	if (n < k * k)
	{
		searched[n] = true;
		
		dp[n] = true;
		
		return true;
	}

	if (n % k == 0)
	{
		searched[n] = true;
		
		dp[n] = false;
		
		return false;
	}

	return isprime(n, k + 2);
}

int main()
{
	int N;

	dp = searched = vector<bool>(10000001, false);

	while (true)
	{
		cin >> N;

		if (N == 0) { break; }

		int Ans = 1145141919;

		if (N % 2 == 0)
		{
			N -= 1;
		}

		if (N % 3 == 0)
		{
			N -= 2;
		}

		for (int i = N;;)
		{
			if (is_prime(i - 8) && is_prime(i - 6) && is_prime(i - 2) && is_prime(i))
			{
				Ans = i; break;
			}

			if (i % 6 == 1)
			{
				i -= 2;
			}
			else
			{
				i -= 4;
			}
		}
		
		cout << Ans << endl;
	}

	return 0;
}

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

int main(){
   bool is_prime[10000000];
   is_prime[0]=is_prime[1]=false;
   for(int i=13;i<10000000;i++)
      is_prime[i]=true;
   for(int i=13;i*i<1000000;i++){
      if(is_prime[i]){
         for(int j=i*i;j<10000000;j+=i){
            is_prime[j]=false;
         }
      }
   }
   while(true){
      int n;
      cin >> n;
      if(n==0)
         break;
      for(int i=n;i!=0;i--){
         if(is_prime[i-8]&&is_prime[i-6]&&is_prime[i-2]&&is_prime[i]){
            cout << i << endl;
            break;
         }
      }
   }
   return 0;
}

C++: #include<stdio.h>
#include<math.h>
#include<iostream>
using namespace std;

int main(){
	int *p,n,i,j,k,a,c=0,t=1;
	scanf("%d", &n);
	while (n>0){
	p = new int[n];
	if (n % 2 == 0){
		n=n - 1;
	}
		for (i = n; i > 1; i-=2){
			for (j = 3; j <=(int) sqrt(i); j+=2){
				if (i%j == 0){
					t = 0;

				}
			}
				if (t==1){
					p[c] = i;
					c++;
				}
				t = 1;
		}
		c = c - 1;
		for (i = 0; i < c-3;i++){
			if (p[i] - 2 == p[i + 1] && p[i] - 6 == p[i + 2]&&p[i]-8&&p[i+3]){
				printf("%d\n",p[i]);
				break;
			}
			
		
		}
		scanf("%d",&n);
		c = 0;
	}
}

C++: #include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i=(b) - 1;i>=(a);i--)
#define REP(i,n) for(int i=0;i<(n);i++)
#define RREP(i,n) for(int i=n-1;i>=0;i--)

#define PB push_back
#define INF INT_MAX/3
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define CLR(a) memset(a,0,sizeof(a))

typedef long long int ll;

using namespace std;

int main(){
    vector<int> primes;
    primes.PB(2);
    FOR(i,3,9999992){
	bool flg = true;
	for(int j=0;primes[j]*primes[j]<=i;j++){
	    if(i % primes[j] == 0){
		flg = false;
		break;
	    }
	}
	if(flg) primes.PB(i);
    }
    int d[] = {8,6,2,0};
    while(true){
	int n;
	cin >> n;
	if(n==0) break;
	int p = upper_bound(ALL(primes),n) - primes.begin();
	RREP(i,p+1){
	    if(primes[i]>n) continue;
	    if(i>=3){
		if(primes[i]==(primes[i-1]+d[2])&&primes[i]==(primes[i-2]+d[1])&&primes[i]==(primes[i-3]+d[0])){
		    cout << primes[i] << endl;
		    break;
		}
	    }
	}
    }
    return 0;
}

C++: #include <iostream>
#include <cstring>
//#include <fstream>

const int N = 10000000;

bool prime[N+1];

using namespace std;

void make_prime (void )
{
	memset (prime, true, sizeof (prime ) );

	prime[0] = false;
	prime[1] = false;

	for (int i = 2; i*i <= N; ++i){
		if (prime[i] ) {
			for (int j = i*i; j <= N; j += i ){
				prime[j] = false;
			} // end for
		} // end if	
	} // end for
}
	
int main()
{
//	cut here before submit 
//	freopen ("testcase.primequad", "r", stdin );

	make_prime();

	int n;
	while (cin >> n && n ){
		for (int i = n; i >= 13; --i ){
			if (prime[i] && prime[i-2] && prime[i-6] && prime[i-8] ){
				cout << i << endl;
				break;
			} // end if
		} // end for
	} // end loop
		
	return 0;
}