import java.math.BigInteger

fun String.toBigInteger() = BigInteger.valueOf(this.toLong())

fun main(){
    val (n, k) = readLine()!!.split(" ").map{it.toInt()}
    val a = readLine()!!.split(" ").map{it.toBigInteger()}

    val ints = mutableSetOf<BigInteger>()
    for(i in 1..(1 shl n)){
        val indexes = mutableSetOf<Int>()
        for(j in 0..n-1){
            if(((i shr j) and 1) == 1)   indexes.add(j)
        }
        if(indexes.size < k)  continue
        ints.add(a.filterIndexed{index,  _ -> indexes.contains(index)}.reduce{s, t -> s*t})
        ints.add(a.filterIndexed{index, _ -> indexes.contains(index)}.reduce{s, t -> s.add(t)})
    }

    println(ints.size)
}