import math
def calc(tokens):
    t = tokens.pop(0)
    if t == "+":

        return calc(tokens) + calc(tokens)

    elif t == "-":

        return calc(tokens) - calc(tokens)

    elif t == "*":

        return calc(tokens) * calc(tokens)

    elif t == "/":

        return calc(tokens) / calc(tokens)

    elif t == "^":
        return calc(tokens) ** calc(tokens)

    elif t == "%":
        return calc(tokens) % calc(tokens)
    elif t == "-l":
        return math.log(calc(tokens))
    elif t == "&":
        return [calc(tokens), calc(tokens)]
    elif t == "£":
        A=calc(tokens)
        B=calc(tokens)
        return [A[0]+B[0], A[1]+B[1]]
    elif t == "@":
        A=calc(tokens)
        B=calc(tokens)
        return [[A[0]*B[0], A[0]*B[1]],[A[1]*B[0], A[1]*B[1]]]
    elif t == "-s":
        return math.sin((math.pi/calc(tokens)))
    elif t == "-c":
        return math.cos((math.pi/calc(tokens)))
    elif t == "+s":
        return math.asin(tokens)
    elif t == "+c":
        return math.acos(tokens)
    
    elif t == "=":
        return (calc(tokens) == calc(tokens))
    else:
        return float(t)
print(calc("= + 1 1 2".split()))
print(calc("£ & 1 2 & 2 1".split()))
print(calc("/ -l 8 -l 2".split()))
print(calc("+ 1 * 3 / -s 4 -c 4".split()))