let input = readLine()!.characters.split(" ").map{Int(String($0))!}
let (R,G,B,N) = (input[0],input[1],input[2],input[3])
var ans = 0
for r in 0...N {
    for g in 0...N {
        let b = N-r*R-g*G
        if b>=0 && b%B==0 {
            ans += 1
        }
    }
}
print(ans)