#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<cmath>
#include<vector>
#define pb push_back
#define RG register
#define il inline
using namespace std;
typedef long long ll;
typedef double dd;
const int N=10000000;
const int mod=100000001;
il ll read(){
    RG ll d=0,w=1;char ch=getchar();
    while(ch!='-'&&(ch<'0'||ch>'9'))ch=getchar();
    if(ch=='-')w=-1,ch=getchar();
    while(ch>='0'&&ch<='9')d=d*10+ch-48,ch=getchar();
    return d*w;
}

int n,A,B,C;
vector<int>a;
dd ans;

int main()
{
    n=read();A=read();B=read();C=read();a.push_back(read());
    for(RG int i=1;i<n;i++)a.pb((1ll*a[i-1]*A+B)%mod);
    for(RG int i=0;i<n;i++)a[i]=a[i]%C+1;
    ans+=min(a[0],a[n-1])*1.0/a[0]/a[n-1];
    for(RG int i=0;i<n-1;i++)ans+=min(a[i],a[i+1])*1.0/a[i]/a[i+1];
    printf("%.3lf\n",ans);
    return 0;
}