import sys
def input(): return sys.stdin.readline().rstrip()


def main():
    L, R, C = map(int, input().split())
    R = min(R, L+2000)
    z = 999
    for i in range(L, R+1):
        z = min(z, -i*C % 1000)
    print(z)


if __name__ == '__main__':
    main()