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;  
  
}  

Pascal :

var
  n,cs:longint;
begin
  read(n);
  while n<>1 do
  begin
    if n mod 2=0 then begin n:=n div 2; inc(cs); end
                 else begin n:=n*3+1; inc(cs); end;
  end;
  write(cs);
end.

Java :

import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n=sc.nextInt();
		int s=0;
		while(n!=1){
			if(n%2==0){
				n=n/2;
				s++;
			}else{
				n=n*3+1;
				s++;
			}
		}
		System.out.println(s);
	}
}

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)