A snail climbs a pole of height h meters, going up a meters during the day and slipping b meters at night (a > b). Determine on what day the snail will reach the top.

Three integers: h, a, b (a > b).

Print the number of the day the snail reaches the top.

[{'input': '10\n3\n2', 'output': '8'}, {'input': '20\n7\n3', 'output': '5'}]