# c = list(input())
# h = len(c)
# count = 10
#
# for i in range(1, h):
#
# if c[i] == '(':
# if c[i - 1] == ')':
# count += 10
# else:
# count += 5
#
# else:
# if c[i - 1] == '(':
# count += 10
# else:
# count += 5
#
# print(count)
from itertools import count
# c,k=input().split()
# c=int(c)
# k=int(k)
# n=list(map(int, input().split()))
# big=-1000000000
# s=0
# for i in range(k):
# s+=n[i]
# big=s
# # print(big)
# r=0
# for i in range(k, c):
# s -= n[r]
# s += n[i]
# if s > big:
# big = s
# r += 1
# print(big)
# c=int(input())
# n=[]
# temp=0
# count=0
# for i in range(c):
# x=int(input())
# n.append(x)
# for i in range(c-1):
# for j in range(c-i-1):
# if n[j] > n[j+1]:
# temp=n[j]
# n[j] = n[j+1]
# n[j+1] = temp
# count += 1
# if count == 0:
# break
# count=0
#
# for i in range(c):
# print(n[i])
# c=int(input())
# mi=1000000000
# where = -1
# n=[]
#
# for i in range(c):
# x=int(input())
# n.append(x)
# for i in range(c-1):
# for j in range(i, c):
# if n[j] < mi:
# mi = n[j]
# where = j
# temp = n[i]
# n[i]=n[where]
# n[where]=temp
# mi=100000000000
# where = -1
# for i in range(c):
# print(n[i])
n=[]
c=[]
for i in range(4):
x,y=input().split()
x=int(x)
y=int(y)
n.append(x)
c.append(y)
for i in range(4):
x = (c[i] - n[i]) * 60
if x<=60:
continue
if x<=300:
x+=x/20
if x>=900:
x