object Main extends App {
    var get = readLine.split(" ")
    var R = get(0).toInt
    var G = get(1).toInt
    var B = get(2).toInt
    var N = get(3).toInt
  var sum=0
  for{i <- 0 to N / R
     j <- 0 to N / G
       k <- 0 to N / B;if(i * R + j * G + k * B == N)} {
           sum = sum + 1
  }
  println(sum)
}