print(
"Oprasi Hitung Cornelius
1.Penjumlahan
2.Pengurangan
3.Pperklaian
4.Pembagian")
x = int(input("masukan 1: "))
y = int(input("masukan 2: "))
a = int(input("operasi hitung: "))
    
    if a = 1:
        z = x + y
        print(z)
    elif a = 2:
        z = x - y
        print(z)
    elif a = 3
        z = x * y:
        print(z)
    elif a = 4
        z = x / y
        print(z)
    else : 
    print ("program error ")
