#include<stdio.h>
#include<stdlib.h>

int main(){
    int n,k,hrs=0,comp=1;
    int rest;
    scanf("%d %d",&n,&k);
    while(comp<=k){
        comp*=2;
        hrs++;
    }
    rest=n-comp;
    hrs+=(rest+k-1)/k;
    printf("%d",hrs);
    printf("\n");
}