#BOJ 1193 분수찾기
x = int(input())
tmp = 1
count = 1
while x > tmp:
count += 1
tmp += count
if count % 2 == 0:
numerator = x - (tmp - count)
denominator = (count + 1) - numerator
else:
denominator = x - (tmp - count)
numerator = (count + 1) - denominator
print(str(numerator) + "/" + str(denominator))