import std.algorithm, std.conv, std.range, std.stdio, std.string;

void main()
{
  auto p1 = readln.chomp.to!int;
  auto p2 = readln.chomp.to!int;
  auto n = readln.chomp.to!int;
  auto r = new int[](n);
  foreach (i; 0..n) r[i] = readln.chomp.to!int;

  auto t = new int[](1000);
  foreach (ri; r) ++t[ri];

  auto ans = 0;
  foreach (ti; t)
    if (ti >= 2)
      ans += (ti-1)*(p1+p2);

  writeln(ans);
}