害死人不偿命的(3n+1)猜想
#include<stdio.h>
int main()
{
int n,step=0;
while(scanf("%d",&n)!=EOF)
{
while(n!=1)
{
if(n%2==0)
n/=2;
else
n=(3*n+1)/2;
step++;
}
}
printf("%d\n",step);
return 0;
} 
