#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10;
int i,x,y,a[N],d[N];
signed main()
{
	ios::sync_with_stdio(0);cin.tie(0);
	int n,m;long long t;cin>>n>>m>>t;
	for(i=1;i<n;++i)cin>>a[i];
	for(i=1;i<=m;++i)cin>>x>>y,d[x]=y;
	for(i=1;i<n;t+=d[++i]-a[i-1])
		if(t<=a[i])puts("No"),exit(0);
	puts("Yes");return 0;
}