#include <bits/stdc++.h>
using namespace std;
int main() {
  int n = 0, m = 0, k = 0, arr[101], seg[100001][3];
  long long sum = 0;
  cin >> n >> m >> k;
  for (int i = 0; i < m; i++) cin >> seg[i][0] >> seg[i][1] >> seg[i][2];
  for (int i = 0; i < k; i++) cin >> arr[i];
  for (int i = 0; i < k; i++) {
    for (int j = 0; j < m; j++) {
      if (arr[i] < seg[j][0] || arr[i] > seg[j][1]) continue;
      sum += (arr[i] - seg[j][0]) + seg[j][2];
    }
  }
  cout << sum;
  return 0;
}
