import time
import math
t = time.clock()
tablica = []
zakres = 100
dokad = int(math.sqrt(zakres))
for i in range(1,zakres+1):
	tablica.append(1)
for i in range(2, dokad+1):
	if tablica[i] != 0:
		j = i+i;
		while j<=zakres:
			tablica[j]=0
			j += i
print(time.clock()-t)