#ovo je definicija fje foo
def foo(a b)
    a*a + 2*a*b + b*b;

foo(2, 3);

def f(x)
    1 + 2 + x;

def g(x)
    x + (1 + 2);

def h(x)
    (1 + 2 + x) * (x + (1 + 2));

f(5);