#!/usr/bin/python
from operator import mul
from fractions import Fraction
from itertools import izip, tee

class MyFraction(Fraction):
    from operator import add, sub, mul, div
    def __add__(self, other):  return MyFraction(reduce(add, map(Fraction, (self, other))))
    def __radd__(self, other): return MyFraction(reduce(add, map(Fraction, (other, self))))
    def __sub__(self, other):  return MyFraction(reduce(sub, map(Fraction, (self, other))))
    def __rsub__(self, other): return MyFraction(reduce(sub, map(Fraction, (other, self))))
    def __mul__(self, other):  return MyFraction(reduce(mul, map(Fraction, (self, other))))
    def __rmul__(self, other): return MyFraction(reduce(mul, map(Fraction, (other, self))))
    def __div__(self, other):  return MyFraction(reduce(div, map(Fraction, (self, other))))
    def __rdiv__(self, other): return MyFraction(reduce(div, map(Fraction, (other, self))))
    def __pow__(self, other):  return MyFraction(reduce(pow, map(Fraction, (self, other))))
    def __rpow__(self, other): return MyFraction(reduce(pow, map(Fraction, (other, self))))
    def __str__(self): return '{}/{}'.format(self.numerator, self.denominator)
    def __repr__(self): return 'MyFraction {}/{}'.format(self.numerator, self.denominator)

def pairwise(iterable):
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)

raw_input()
print reduce(mul, map(lambda (x, y): MyFraction(y, x), pairwise(map(int, raw_input().split()))))