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- #include <cstdio>
- using namespace std;
- char vaz[2000010];
- int main()
- {
- freopen("ciur.in", "r", stdin);
- freopen("ciur.out", "w", stdout);
- int n,nr=0;
- scanf("%d",&n);
- for(int i=2;i<=n;i++)
- if(!vaz[i])
- {
- nr++;
- if(1LL*i*i<=n)
- for(int j=i*i;j<=n;j+=i) vaz[j]=1;
- }
- printf("%d",nr);
- return 0;
- }
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