#include <stdio.h>
int main(void){
    int a,max=0;
    scanf("%d",&a);
    int b=a;
    int count;
    while(1){
if(max<=a){max=a;}
if(a%2==0){a=a/2;}
else{a=3*a+1;}
if(count==0){printf("%d\n",&b);}
if(a==1){break;}
count++;
    }

    printf("%d\n",max);
    return 0;
}