a1 = 31
a2 = 28
a3 = 31
a4 = 30
a5 = 31
a6 = 30
a7 = 31
a8 = 31
a9 = 30
a10 = 31
a11 = 30
a12 = 31


m, d = map(int, input().split())

m1 = 365
m2 = m1 - a2
m3 = m2 - a3
m4 = m3 - a4
m5 = m4 - a5
m6 = m5 - a6
m7 = m6 - a7
m8 = m7 - a8
m9 = m8 - a9
m10 = m9 - a10
m11 = m10 - a11
m12 = m11 - a12
if m>0 and m<13:

  if m == 1:
    if d>0 and d<=31:
      print(m1-d)
    else:
      print(-1)

  elif m == 2:
    if d>0 and d<=28:
      print(m2-d)
    else:
      print(-1)


  elif m == 3:
    if d>0 and d<=31:
      print(m3-d)
    else:
      print(-1)

  elif m == 4:
    if d>0 and d<=31:
      print(m4-d)
    else:
      print(-1)

  elif m == 5:
    if d>0 and d<=31:
      print(m5-d)
    else:
      print(-1)

  elif m == 6:
    if d>0 and d<=30:
      print(m6-d)
    else:
      print(-1)

  elif m == 7:
    if d>0 and d<=31:
      print(m7-d)
    else:
      print(-1)

  elif m == 8:
    if d>0 and d<=31:
      print(m8-d)
    else:
      print(-1)

  elif m == 9:
    if d>0 and d<=30:
      print(m9-d)
    else:
      print(-1)

  elif m == 10:
    if d>0 and d<=31:
      print(m10-d)
    else:
      print(-1)

  elif m == 11:
    if d>0 and d<=30:
      print(m11-d)
    else:
      print(-1)

  elif m == 12:
    if d>0 and d<=31:
      print(m12-d)
    else:
      print(-1)
else:
  print(-1)