insertbiti

#include <iostream>

using namespace std;

int main()
{
    unsigned long long int n,m,i,mask1=0,k=0,cm,mask2=0,mask=0;
    cin>>n>>m>>i;
    cm=m;
    while(cm>1)
    {
        cm>>=1;
        ++k;
    }
    //cout<<mask2<<'\n';
    mask2=~mask2;
    //cout<<mask2<<'\n';
    mask2<<=(k+i);
    //cout<<mask2;
    mask1=(1 << i);
    mask1=(mask1-1);
    mask=mask1 | mask2;
    m<<= i;
    n&= mask;;
    n|= m;
    cout<<n;
    return 0;
}