#include <cstdio>
int main(){
    long long n,m,num = 0;
    scanf("%lld%lld",&n,&m);
    while(n > 3 * m + 1){
        n -= 2 * m;
        num++;
    }
    int i = 1;
    while(i <= n){
        num++;
        i *= 3;
    }
    printf("%lld",num);
    return 0;
}