C :

#include<stdio.h>

void main(){
    int n,c=0;
    scanf("%d",&n);

    while(n!=1){
        if(n%2==0){
            n=n/2;
        }else{
            n=n*3+1;
        }
        c++;
    }
    printf("%d",c);
}

C++ :

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

Python :

n = int(input())
c = 0
while True:
    if n % 2 == 0:
        n = n // 2
    else:
        n = n * 3 + 1
    c += 1
    if n == 1:
        break
print(c)