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Cod sursa(job #156728)
# include <stdio.h>
# define input "ciur.in"
# define output "ciur.out"
# define max 1000001
int n,a[max],i,j,res;
int main()
{
freopen(input, "r", stdin);
freopen(output, "w", stdout);
scanf("%d",&n);
for(i=2;i<=n;i++)
if(!a[i])
{
res++;
for(j=i+i;j<=n;j+=i)
a[j] = 1;
}
printf("%d",res);
return 0;
}