#include
using namespace std;
int main()
{
const int n=5;
int a[n]={1,4,7,9,3};
int b,i,j;
cin>>b;
for(i=0;i<n;i++)
{
if(b==a[i])
break;
}
if(j==n)
cout<<"no!";
else
cout<<i;
}
#include
using namespace std;
int main()
{
const int n=5;
int a[n]={1,4,7,9,3};
int b,i,j;
cin>>b;
for(i=0;i<n;i++)
{
if(b==a[i])
break;
}
if(j==n)
cout<<"no!";
else
cout<<i;
}