def test(a, b=10, c=20):
return a + b+ c
a = test(10, 20, 30)
b = test(10, 20)
c = test(10)
print(a + b+ c)
ZGVmIHRlc3QoYSwgYj0xMCwgYz0yMCk6CglyZXR1cm4gYSArIGIrIGMKIAphID0gdGVzdCgxMCwgMjAsIDMwKQpiID0gdGVzdCgxMCwgMjApCmMgPSB0ZXN0KDEwKQoKcHJpbnQoYSArIGIrIGMpCgoKICAgIAogICAg