#include<bits/stdc++.h>
using namespace std;
int n,b,ans;
int a[300]={0};
int c[300][10]={0};

void ss(int x,int y)
{
    int i;
    if(x==n&&y<=ans)
    {
        ans=y;
        return;
    }
    if(y>=b||x==n)
    {
        return;
    }
    ss(x,y+1);
    for(i=1;i<=n;i++)
    {
        if(x+i==n||i==c[y][2]||a[x+i+1]>c[y][1])
        {
            break;
        }
    }
    ss(x+i,y);
    return;
}
int main()
{
    freopen("snowboots_silver_18feb.in","r",stdin);
    freopen("snowboots_silver_18feb.out","w",stdout);
    int i,j;
    cin>>n>>b;
    ans=b;
    for(i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    for(i=1;i<=b;i++)
    {
        cin>>c[i][1]>>c[i][2];
    }
    ss(1,0);
    cout<<ans;
    return 0;
}