n = int(input())
i = 1
if n == 1:
print('1/1')
else:
while True:
if (i*(i+1))/2 < n <= ((i+1)*(i+2))/2:
break
i += 1
alist = []
for a in range(1, i+2):
alist.append(str(i+2-a)+"/"+str(a))
answer = int(n-int((i*(i+1))/2)-1)
print(alist[answer])
biA9IGludChpbnB1dCgpKQppID0gMQppZiBuID09IDE6CiAgICBwcmludCgnMS8xJykKZWxzZToKICAgIHdoaWxlIFRydWU6CiAgICAgICAgaWYgKGkqKGkrMSkpLzIgPCBuIDw9ICgoaSsxKSooaSsyKSkvMjoKICAgICAgICAgICAgYnJlYWsKICAgICAgICBpICs9IDEKCiAgICBhbGlzdCA9IFtdCiAgICBmb3IgYSBpbiByYW5nZSgxLCBpKzIpOgogICAgICAgIGFsaXN0LmFwcGVuZChzdHIoaSsyLWEpKyIvIitzdHIoYSkpCiAgICBhbnN3ZXIgPSBpbnQobi1pbnQoKGkqKGkrMSkpLzIpLTEpCiAgICBwcmludChhbGlzdFthbnN3ZXJdKQ==