def get_data():
    D = int(input())
    return D

def list_num(D):
    l = []
    for i in range(D):
        l = l + list(f"{i+1}")
    return l

def main():
    D = get_data()
    l = list_num(D)
    print(l[D - 1])

if __name__=='__main__':
    main()