import ast
import operator as op
from sys import stdin, stdout

input = lambda: stdin.readline().rstrip()
write = stdout.write
operators = {ast.Add: op.add, ast.Sub: op.sub, ast.Mult: op.mul,
             ast.Div: op.truediv, ast.Pow: op.pow, ast.BitXor: op.xor,
             ast.USub: op.neg}

def eval_expr(expr):
    return eval_(ast.parse(expr, mode='eval').body)

def eval_(node):
    if isinstance(node, ast.Num):
        return node.n
    elif isinstance(node, ast.BinOp):
        return operators[type(node.op)](eval_(node.left), eval_(node.right))
    elif isinstance(node, ast.UnaryOp):
        return operators[type(node.op)](eval_(node.operand))
    else:
        raise TypeError(node)

def main():
    S = input()
    print(eval_expr(S))

main()