def main():
    N, K, T = map(int, input().split())
    distance = (K * T)
    if N > 0:
        D = distance * 1
        if N <= D:
            print('Yes')
        elif N > D:
            print('No')
    elif N < 0:
        D = distance * -1 
        if N < D:
            print('No')
        elif N >= D:
            print('Yes')

if __name__ == '__main__':
    main()