class Time():
    def __init__(self,h,m):
        self.hours = h
        self.minutes = m

    def __add__(self,other):
        m = self.minutes + other.minutes
        h = self.hours + other.hours
        if m > 60:
            m -= 60
            h += 1
        return Time(h,m)

    def __str__(self):
        return str(self.hours)+" hours and "+str(self.minutes)+" minutes"

sum = Time(0,0)
with open("times.txt") as f:
    for line in f.readlines():
        txt = line.split()
        sum = sum + Time(int(txt[0]),int(txt[1]))

print(str(sum))