#include<iostream>
using namespace std;

int main()
{
		int a, b, N;
		int R[1000];
		int n;
		int sum;
		int count = 0;

		cin >> a >> b >> N;
		for (int i = 0; i < N; i++)
		{
			cin >> n;
			if (R[n] == 0)
			{
				count++;
			}
			else
			{
				R[n] = 0;
			}
		}

		sum = (a + b)*count;

		cout << sum;
	
	return 0;
}