递归函数的调用次数的计数

#include <stdio.h>
int count = -1;//计数用 
int num(int n){
    count++;
    if(n==1)
        return count;
    if(n%2==0){
        return num(n/2);
    }
    if(n%2!=0){
        return num((3*n+1)/2);
    }
    return count;
}

int main() {
    int i;
    scanf("%d",&i); 
    printf("%d",num(i));
    return 0;
}