#include<bits/stdc++.h>
using namespace std;
int n,b,f[255],s[255],d[255],pos=1,ans=0;
int main(){
    freopen("snowboots_silver_18feb.in","r",stdin);
    freopen("snowboots_silver_18feb.out","w",stdout);
    scanf("%d%d",&n,&b);
    for(int i=1;i<=n;i++)scanf("%d",&f[i]);
    for(int i=1;i<=b;i++)scanf("%d%d",&s[i],&d[i]);
    while(pos!=n)
    {
        int i=ans+1;
        for(int j=min(pos+d[i],n);j>=pos+1;j--)
        {
            if(s[i]>=f[j])
            {
                pos=j;
                ans--;
                break;
            }
        }
        ans++;
    }
    printf("%d\n",ans);
    return 0;
}