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#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
long long h,w,n,b;
std::vector<long long>obr;

std::vector<long long>x,y;
int main() {
    std::ios_base::sync_with_stdio(0);
    std::cin.tie(NULL);
    std::cin>>h>>w>>n;
    x.resize(n);
    y.resize(n);
    for(int i=0;i<n;i++){
        std::cin>>b;
        obr.emplace_back(b);
    }

    for(int i=n-1;i>=0;i--){
        x[i]=h/obr[i];
        h%=obr[i];
        y[i]=w/obr[i];
        w%=obr[i];
    }

    if(h+w!=0){
        std::cout<<-1<<std::endl;
        return 0;
    }
    long long result=0;
    for(int i=0;i<n;i++)
    for(int j=0;j<n;j++){
        result+=(j>i?obr[j]/obr[i]:obr[i]/obr[j])*x[i]*y[j];
    }
    std::cout<<result<<std::endl;



}