The probability that A, B and C can solve a problem are $\frac{4}{5},\frac{2}{3}$ and $\frac{3}{7}$  respectively. The probability of the problem being solved by A and B is $\frac{8}{15}$, B and C is $\frac{2}{7}$, A and C is $\frac{12}{35}$. The probability of the problem being solved by all the three is  $\frac{8}{35}$.
Find the probability that the problem can be solved by at least one of them.