$$5^{1}\cdot5^{4}=5^{1+4}=5^{5}$$,  \uline{Teacher should introduce the formula of $$a^{m}a^{n}=a^{m+n}$$}. 
What is the value of $$5^{4}+5^{4}+5^{4}+5^{4}+5^{4}$$? 

1) $$5^{4}$$ 
2) $$5^{5}$$ 
3) $$5^{6}$$ 
4) $$5^{10}$$ 
5) $$5^{20}$$ 