int a[]={0,13, 6, 34, 3,9 ,18,45,1,8,7,11,15,21,44,51};

int tim(int x){

n = 15;

int i=1;

while(i<=n)

if(a[i]==x) return i;

else if(a[i]

else i=2*i;

return -1;

}