MAX_C = 10 ** 9
x, y, a = read_line.split.map &.to_i
check = ->(i : Int32) {
  x * i // 100 < y * i // 100 + a
}
if x == y
  puts a == 0 ? MAX_C : 0
else
  limit = (a + 1) * 100
  puts (1..limit).count { |i| check.call(i) } + (check.call(limit + 1) ? 1 : 0) * (MAX_C - limit)
end