#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define maxn 10000000
inline int read()
{
int s=0,w=1;
char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
return s*w;
}
int A,B,C;
int n;
int a[10000010];
double res;
inline void generate()
{
//cout<<1;
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;
//cout<<1;
}
int main()
{
generate();
/* for(int i=1;i<=n;i++)
{
cout<<a[i]<<" ";
}*/
for(int i=2;i<=n+1;i++)
{
if(i==n+1)
{
double t1=min(a[n],a[1]);
double t2=a[n]*a[1];
double t3=(double)t1/t2;
res+=t3;
break;
}
double t1=min(a[i],a[i-1]);
double t2=a[i]*a[i-1];
double t3=(double)t1/t2;
res+=t3;
}
printf("%.3lf",res);
return 0;
}