Question: You have m leke and you want to buy 3 items. You want to buy the items in order (you will buy the first item and if you have more money then you will buy the second one, etc. ) How many items you can buy?

Input specification: You will be first given 3 integer numbers, the total amounts of three items (at,bt,ct). On the next line, the total amount (m) you have. All the numbers are integers not greater than 10 million.

Output specification: Show one number, the number of items that you can buy.

Explanation: You will buy the items in order. For the first sample, you have the money to buy the first and second items (2) but you don't have enough money to buy the third one. For the second sample, Although you have enough money to buy the second and third items, but you are buying the items in order. So, you don't have enough money to buy the first one, And thus, you buy no items (0).