791 B | 791 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from decimal import Decimal
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
tc = 1
while 1:
a, b, c, d = mii()
if a == b == c == d == -1:
break
a %= 23
b %= 28
c %= 33
for i in range(1, 1000):
z = a + 23 * i
if (z - b) % 28 == 0 and (z - c) % 33 == 0:
p(f"Case {tc}: the next triple peak occurs in {z - d} days.")
break
tc += 1
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()