#include <iostream>

int index( int n )
{
    return 3 - ( n >> 8 ) + ( n >> 10 );
}

void test( int n )
{
    std::cout << n << " - "  << index( n ) << std::endl;
}

int main() {
    for( int i : {1024, 512, 256, 128 } )
        test( i );
    return 0;
}