|Online MIPT programming contest||РУССКИЙ|
Time limit = 3 second(s)Every athlete is characterized by his mass mi (in kg) and strength si(in kg).
You are to find the maximum number of athletes that can form a tower standing one upon another.
An athlete can hold a tower of athlets with total mass equal to his strength or less than his strength.
Input contains the number of athletes n and their parameters:
n m1 s1 m2 s2 ... mn sn
If mi > mj then si > sj, but athletes with equal masses can be of different strength.
Number of athletes n < 100000. Masses and strengths are positive integers less than 2000000.
4 3 4 2 2 7 6 4 5
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