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#include 
#include 
#include 

int main()
{
    int n,i,j; //declaring required variables
    scanf("%d",&n); //scanning n(limit numbers)
    bool arr[n+1]; //declaring an array which contains true and false values
    arr[1]=false; //setting the first index to false (1 is not a prime number)
    
    for(i=2;i<=n;i++){
        arr[i]=true; //we are assuming that all the numbers are true which means prime
    }
    
    for(i=2;i