function Main (input) {
    var line = input.split("\n").map(Number);
    var P1 = line[0];
    var P2 = line[1];
    var  N = line[2];
    var reservedList = [] ;
    var C = 0;

    for (var i = 3 ; i < line.length ; i ++) {
        if( reservedList.indexOf( line[i] ) == -1){
            reservedList.push( line[i] );
        } else {
            C += P1 + P2;
        }
    }
    console.log( C );
}

Main(require("fs").readFileSync("/dev/stdin","utf8"));