记录

#include<bits/stdc++.h>
#define int unsigned long long
using namespace std;
int read(){
	int x=0,f=1;
	char ch=getchar();
	while(!isdigit(ch)){
		if(ch=='-'){
			f=-1;
		}
		ch=getchar();
	}
	while(isdigit(ch)){
		x=(x<<1)+(x<<3)+(ch^48);
		ch=getchar();
	}
	return x*f;
}
int qpow(int a,int b,int p){
	int ans=1%p;
	for(;b;b>>=1){
		if(b&1){
			ans=ans*a%p;
		}
		a=a*a%p;
	}
	return ans;
}
int n,p,k,a[5000005],s[5000005],sv[5000005],ans;
signed main(){
	n=read();
	p=read();
	k=read();
	s[0]=1;
	for(int i=1;i<=n;i++){
		a[i]=read();
		s[i]=s[i-1]*a[i]%p;
	}
	sv[n]=qpow(s[n],p-2,p);
	for(int i=n-1;i>=1;i--){
		sv[i]=sv[i+1]*a[i+1]%p;
	}
	int t=k;
	for(int i=1;i<=n;i++){
		ans+=k*s[i-1]*sv[i]%p;
		k=k*t%p;
	}
	cout<<ans%p;
	return 0;
}