输入描述:

Each input file contains one test case. Each case starts with a positive integer N (=100), followed in the next line N rational numbers "a1b1 a2b2 ..." where all the numerators and denominators are in the range of "long int". If there is a negative number, then the sign must appear in front of the numerator.

输出描述:

For each test case, output the sum in the simplest form "integer numeratordenominator" where "integer" is the integer part of the sum, "numerator" "denominator", and the numerator and the denominator have no common factor. You must output only the fractional part if the integer part is 0.

5
2/5 4/15 1/30 -2/60 8/3

3 1/3