Challenges

Rotate Array
You are given an array of N length. You have to rotate the array right...
Max. Marks: 6
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Floating Number
Bob has a floating point number N. He wants to set the precision for 2...
Max. Marks: 4
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SwapMaster solves Symmetric Swap
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String Matching
Cody has a sequence of characters N. He likes a sequence if it contain...
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Leap Year
Steve is playing a quiz game with his brother John. As Steve just lear...
Max. Marks: 6
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Project Teams
There are N students in a class and Teacher want to divide these stude...
Max. Marks: 5
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Circle of Numbers
All numbers in NumberLand are standing in a circle for a dancing cerem...
Max. Marks: 6
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Happy String
A happy string is a string in which each character is lexicographicall...
Max. Marks: 4
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Degree Celsius
Tom is a scientist. He uses huge machines for complex calculations. Th...
Max. Marks: 4
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Three's Company
This problem requires you to create a output string from input string ...
Max. Marks: 4
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CashBack
Please select a challenge
Problem Statement
Joel wants to buy N items. He came to know that for each item there is a cash back of some amount. The i th item will have cost Ci dollar and cash back of Xi dollar. Initially, Joel has M dollars. Find the minimum value of M, that Joel must have initially, so Joel can buy all the N items. Note: Joel can buy items in any order.

Input
The first line will contain N, the number of items Joel has to buy. Next, N lines will have two space-separated integers Ci and Xi, representing the cost of the item and cashback Joel will get respectively for ith Item.

Output
Output a single integer M that is the minimum dollars Joel requires initially.

Constraints
1 <= N,Ci,Xi <=10^5

Sample Input
2
1 1
2 1

Sample Output

2

Dcoded By: Bhanu Nadar

Solved By: 395

Maximum Marks: 15