X, N, T = map(int, input().split())
time_left = 300 - 60 # 4 сағат = 240 минут
made = X
additional = time_left // T
made += additional
if made > N:
made = N
print(made)
WCwgTiwgVCA9IG1hcChpbnQsIGlucHV0KCkuc3BsaXQoKSkKCnRpbWVfbGVmdCA9IDMwMCAtIDYwICAjIDQg0YHQsNKT0LDRgiA9IDI0MCDQvNC40L3Rg9GCCgptYWRlID0gWAoKYWRkaXRpb25hbCA9IHRpbWVfbGVmdCAvLyBUCgptYWRlICs9IGFkZGl0aW9uYWwKCmlmIG1hZGUgPiBOOgoKICAgIG1hZGUgPSBOCgpwcmludChtYWRlKQ==