import time
n=int(input())
tm=[]
for i in range(n):
    tm.append(int(input()))
y1,s1=input().split('-',1)
y2,s2=input().split('-',1)
t1=time.mktime(time.strptime("1985-"+s1,"%Y-%m-%d-%H:%M"))
t2=time.mktime(time.strptime("1985-"+s2,"%Y-%m-%d-%H:%M"))

tmc=(t2-t1)/60+(int(y2)-int(y1))*365*24*60
tm.sort()
ans=0
for i in tm:
    if tmc>=i:
        ans+=1
        tmc-=i
    else:
        break
print(ans)