Once, when Dino was solving a problem related to arrays, he saw that the size of all arrays is at most 106. Since Dino is a dinosaur, this number seemed very small to him. Therefore, he decided to create a big array.
Dino first creates an empty array and selects n pairs of numbers: (a1,b1),(a2,b2),...,(an,bn). Then for each of these pairs he inserts into array the number bi ai times. For example,if the first pair is (3,5), the number 5 will be inserted into array 3 times. After that, Dino decides to arrange this array in non-decreasing order, but since the array is very large, Dino's computer cannot perform this arrangement. He is interested in the k-th (the array is numbered starting from 1) number. Help Dino to find this number.
First line contains number n (1≤n≤105). Each of the next n lines contains pair (ai,bi) (1≤ai,bi≤105). The last line contains number k. It is guaranteed that k-th number exists in array.
Print the k-th number in non-decreasing array.