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Problem 2502. -- How many roses can he buy?

2502: How many roses can he buy?

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 1803  Solved: 1179
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Description

小慧过生日,小明要给小慧买鲜花作为礼物,每枝红玫瑰5元钱,满5枝赠送1枝,满20枝赠送5枝,小明一共有n(n>10)元钱,为了让小慧高兴,小明希望能买到最多的红玫瑰,请你帮小明明算算,他最多能买到多少枝?

Input

钱数n

Output

买到的玫瑰数

Sample Input

135

Sample Output

33

HINT

Source

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