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 <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,3,9999863){
	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);
    }

    primes.PB(9999863);
    primes.PB(9999877);
    primes.PB(9999883);
    primes.PB(9999889);
    primes.PB(9999901);
    primes.PB(9999907);
    primes.PB(9999929);
    primes.PB(9999931);
    primes.PB(9999937);
    primes.PB(9999943);
    primes.PB(9999971);
    primes.PB(9999973);
    primes.PB(9999991);
    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>
using namespace std;

int main(){
	 bool *is_prime = new bool[10000000];
	
	is_prime[0] = is_prime[1] = false;
	for(int i = 2; i < 10000000; i++){
		is_prime[i] = true;
	}
	for(int i = 2; i * i < 10000000; 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 > 2; i--){
			if(is_prime[i] && is_prime[i - 2] && is_prime[i - 6] && is_prime[i - 8]){
				cout << i << endl;
				break;
			}
		}
	}
	delete[] is_prime;
	return 0;
}

C++: #include<stdio.h>
int main(void)
{
    int n,i,j,flg,w,a,b,c,d;
	while(1){
	    scanf("%d",&n);
		if(n==0) break;
		a=0;
		b=0;
		c=0;
		d=0;
		for(i=n;i>=5;i--){
		    flg=1;
		    for(j=2;j<i/2;j++){
			    w=i%j;
				if(w==0){
				    flg=0;
					break;
				}
			}
			if(flg==1){
			    d=c;
				c=b;
				b=a;
				a=i;
			}
			if(d==c+2&&d==b+6&&d==a+8) break;
		}
		printf("%d\n",d);
	}
	return 0;
}

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

#define rep_(v, f, l) for (int v = (f); v < (l); ++v)
#define rep(v, n) rep_(v, 0, n)
#define lep(v, n) rep_(v, 1, n + 1)

using namespace std;

typedef long long int lint;

static inline int in(){ int x; scanf("%d", &x); return x; }
static inline lint inl(){ lint x; scanf("%lld", &x); return x; }

const int MAX_N = 10000000;

bool sieve[MAX_N + 1];
int main()
{
    rep(i, MAX_N + 1) sieve[i] = true;
    for (int i = 2; i * i <= MAX_N; i++){
        for (int j = i * i; j <= MAX_N; j += i){
            sieve[j] = false;
        }
    }
    vector<int> quad_prime;
    for (int i = 13; i <= MAX_N; i += 2){
        if (sieve[i] && sieve[i - 2] && sieve[i - 6] && sieve[i - 8]){
            quad_prime.push_back(i);
        }
    }

    int n;
    while (n = in()){
        printf("%d\n", quad_prime[upper_bound(quad_prime.begin(), quad_prime.end(), n) - quad_prime.begin() - 1]);
    }

    return (0);
}

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

const int nmax = 10000000;
char nums[nmax];

int main(){
	int n;
	for(int i = 2; i < nmax; i++){
		nums[i] = '1';
	}
	for(int i = 2; i * i < nmax; i++){
		if(nums[i] == '1'){
			for(int k = 2; k * i < nmax; k++){
				nums[i*k] = '0';
			}
		}
	}
	while(cin >> n){
		if(n == 0) break;
		int i = n;
		while(nums[i] == '0' || nums[i-2] == '0' || nums[i-6] == '0' || nums[i-8] == '0') i--;
		cout << i << endl;
	}
	return 0;
}