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

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int n,k,m; cin>>n>>k>>m;
    vector<int> v(n+1);
    for(int i=1; i<=n; i++)
        cin>>v[i];
    vector<array<int, 2>> op(m);
    for(auto &[a,b]:op) cin>>a>>b;
    int lo=0,hi=n+1;
    while(lo<hi-1)
    {
        int mid=(lo+hi)/2;
        bool kint=0;
        int pos=mid;
        for(auto &[a,b]:op)
        {
            if(v[pos]==a) pos+=b;
            if(pos>n) break;
            if(pos<1)
            {
                kint=1;
                break;
            }
        }
        if(kint) lo=mid;
        else hi=mid;
    }
    int ans=lo;
    lo=0,hi=n+1;
    while(lo<hi-1)
    {
        int mid=(lo+hi)/2;
        bool kint=0;
        int pos=mid;
        for(auto &[a,b]:op)
        {
            if(v[pos]==a) pos+=b;
            if(pos<1) break;
            if(pos>n)
            {
                kint=1;
                break;
            }
        }
        if(kint) hi=mid;
        else lo=mid;
    }
    ans+=n-lo;
    cout<<n-ans;
}