924subject3.c

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