..
#include <cmath>
#include <algorithm>
using namespace std;
#define LL long long
LL n,A,B,C,a[
10000000+
1];
int main()
{
scanf(
"%d%d%d%d%d",&n,&A,&B,&C,a+
1);
for (
int i=
2;i<=n;i++) a[i] = ((
long long)a[i-
1] * A + B) %
100000001;
for (
int i=
1;i<=n;i++) a[i] = a[i] % C +
1;
double ans=
0;
for(
int i=
1;i<n;i++) ans+=
1.0/max(a[i],a[i+
1]);
ans+=
1.0/max(a[
1],a[n]);
printf(
"%.3lf\n",ans);
return 0;
}
