def smartNumber(n):
	MAX = 3000 
	 
	primes = [0] * MAX 
	result = [] 
	for i in range(2, MAX): 
		if (primes[i] == 0): 
			primes[i] = 1 
			j = i * 2 
			while (j < MAX): 
				primes[j] -= 1 
				if ( (primes[j] + 3) == 0): 
					result.append(j) 
				j = j + i 
	result.sort() 
	return result[n - 1] 
def min_cost(cost, m, n):
	R = 3
	C = 3
	 
	tc = [[0 for x in range(C)] for x in range(R)] 
	tc[0][0] = cost[0][0] 
	for i in range(1, m+1): 
		tc[i][0] = tc[i-1][0] + cost[i][0] 
	for j in range(1, n+1): 
		tc[0][j] = tc[0][j-1] + cost[0][j] 
	for i in range(1, m+1): 
		for j in range(1, n+1): 
			tc[i][j] = min(tc[i-1][j-1], tc[i-1][j], tc[i][j-1]) + cost[i][j] 
	return tc[m][n]