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Rent a car and ride the greenway
The department organizes green island cycling team building activities. Rent public tandem bicycles, each bicycle can seat up to two people, and do the maximum load M. Given the weight of each person in the department, what is the maximum number of tandem bicycles that can be rented.
Enter a description:
The two numbers m and n in the first line respectively represent the weight limit of bicycles and the total number of people in the department.
In the second line, n numbers represent the weight of each person, and the weight is less than or equal to the bicycle weight limit m.