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#include <iostream>
#include <fstream>
using namespace std;
int taiat[100];
int main()
{
int v[100],i,j,k=0,n;
k=0;
cin>>n;
for(i=1;i<=n;i++)
v[i]=k+1;
ifstream f("ciur.in");
ofstream g("ciur.out");
for(i=2;i<=n;i++)
{
if(taiat[i]==0)
for(j=i+i;j<=n;j+=i)
taiat[j]=1;
}
k=0;
for(i=1;i<=n;i++)
cout<<taiat[i];
for(i=1;i<=n;i++)
if(taiat[i]==0)
k++;
g<<k;
}