#include<bits/stdc++.h>
using namespace std;
typedef long long LL;

#define CIN_ONLY if(1)
struct cww{cww(){
    CIN_ONLY{
        ios::sync_with_stdio(false);cin.tie(0);
    }
}}star;
#define fin "\n"
#define FOR(i,bg,ed) for(int i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
#define pb push_back
#define DEBUG if(0)
#define REC(ret, ...) std::function<ret (__VA_ARGS__)>
template <typename T>inline bool chmin(T &l,T r)
{bool a=l>r;if(a)l=r;return a;}
template <typename T>inline bool chmax(T &l,T r)
{bool a=l<r;if(a)l=r;return a;}
template <typename T>
istream& operator>>(istream &is,vector<T> &v){
    for(auto &it:v)is>>it;
    return is;
}
    
int main(){
    double x,y;
    cin>>x>>y;
    int n;
    cin>>n;
    vector<double> a(n);
    cin>>a;
    vector<double> b(n);
    vector<double> c(n);
    REP(i,n){
        b[i]=a[i]/x;
        c[i]=a[i]/y;
    }
    REP(i,n-1){
        if(b[i]>c[i+1]){
            cout<<"NO"<<endl;return 0;
        }}
    cout<<"YES"<<endl;
        
        
    return 0;
}