#include <stdio.h>
int main(){
int n;
int count=0;
if (scanf("%d",&n)!=EOF){
while (n!=1){
if (n%2==0){n=n/2;}
else{n=3*n+1;}
count++;
}
printf("%d",count);
}
else{
printf("input wrong");
}
return 0;
}
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