Untitled

#include <bits/stdc++.h>

unsigned long long n,m;

int main()
{
 long long a, l, r;
 cin >> a >> l >> r;
 long long  x = a&((1<<l)-1);
 int len = (int)(trunc(log2(a))+1);
 a = ((a>>(r+1)) ??? (r+1));
 cout<<a+x;
}