import kotlin.math.max

fun main() {
    val builder = StringBuilder()

    // なにもわからん
    val n = readInputLine().toInt()

    val s = readInputLine()
    val t = readInputLine()

    var s1Cnt = 0
    var s2Cnt = 0
    var t1Cnt = 0
    var t2Cnt = 0

    for (c in s) {
        when (c) {
            '1' -> s1Cnt++
            '2' -> s2Cnt++
        }
    }

    for (c in t) {
        when (c) {
            '1' -> t1Cnt++
            '2' -> t2Cnt++
        }
    }

    var ans = if (s2Cnt != 0 && t2Cnt != 0) {
        n * (s2Cnt + t2Cnt) - s2Cnt * t2Cnt
    } else if (t2Cnt != 0) {
        n * t2Cnt + t1Cnt
    } else if (s2Cnt != 0) {
        n * s2Cnt + s1Cnt
    } else {
        max(s1Cnt, t1Cnt)
    }

    builder.appendln(ans)

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}