f = open("output", "ru")
o = []
for line in f:
    xs = line.split(" ")
    o.append(xs[1])

i = 0
oo = []
for x in range(len(o)/2):
    oo.append((float(o[i]),float(o[i+1])))
    i+= 2

counter = 0
ucount = 0
for x in oo:
    if x[0]/x[1]<1:
        ucount+=1
    counter += 1

print str(ucount)+ "/" + str(counter) +" were tails biased"