Three Sevens - the match three of 7 1.0

I guess you must love numbers.
So you must play this puzzle game : Three Sevens or Seven trio.
Your goal is to make at least three sevens side by side horizontally or vertically by
pushing numbers from 1 to 5 and they will merge together.

For example:
1 merges 2 will make a new number 3
or 2 merges with 5 will make a new number 7

Try to observe numbers and plan carefully before choosing the right solution.