a, b, c, d = map(int, input().split())
delta = (a-1)*d
num = 60 * b + c
num += delta
num %= (60*24)
o = num/600
num%=600
p = num/60
num%=60
q = num/10
num%=10
r = num
print(o,end='')
print(p)
print(q,end='')
print(r)