P1069 细胞*

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std;

const int N=1e4+5;

int n,m1,m2;
int s[N],prime[N],maxn,t=2,c,ans=0x7fffffff,l;


int main()
{
    scanf("%d%d%d",&n,&m1,&m2);
    for(int i=1;i<=n;++i)
        scanf("%d",s+i);
    if(m1==1)
    {
        printf("0");
        return 0;
    }
    while(m1!=1)
    {
        while(m1%t==0)
            m1/=t,++prime[t];
        maxn=max(maxn,t);
        prime[t++]*=m2;        //a的幂乘以a的幂'=a的(幂+幂')次方 
    }
    for(int i=1;i<=n;++i)
    {
        l=0;
        for(int j=2;j<=maxn;++j)
        {
            if(!prime[j])
                continue;
            c=0;
            while(s[i]%j==0)
                s[i]/=j,++c;
            if(!c)
            {
                l=0x7fffffff;
                break;
            }
            l=max(l,(prime[j]-1)/c);    //次数  
        }
        ans=min(ans,l);
    }
    printf("%d",ans==0x7fffffff?-1:ans+1);
    return 0;
}