#include <bits/stdc++.h>
using namespace std;
#define max(a, b) (a > b ? a : b)
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, k, r;cin>>n>>k>>r;
int* dna = new int[n];
for (int i = 0;i < n;i++)
cin >> dna[i];
unordered_map<int, int> creq;
for (int i = 0;i < r;i++)
{
int x, y;
cin >> x >> y;
creq[x] = y;
}
int min_len = 1e9;
for (int i = 0;i < n;i++)
{
unordered_map<int, int> req = creq;
for (int j = i;j < i + min_len;j++)
{
if (req[dna[j]])
{
req[dna[j]]--;
}
if (req[dna[j]] == 0)
req.erase(dna[j]);
if (!req.size())
min_len = min(min_len, j - i + 1);
}
}
cout << min_len;
return 0;
}
