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I=input()
list=I.split()
x,d,h,m=int(list[0]),int(list[1]),int(list[2]),int(list[3])
if x<5:
    print(1440*(x+24-d)-60*h-m)
elif d<29 or h<3:
    print(1440*(30-d)-60*(h+1)-m)
else: print(1440-60*h-m)