Byang is going to join a new school. His new class has N students.
Each of the students are identified by their roll numbers starting from 1 to N. Byang is going to get the next roll number in the sequence.
Byang plans to make friends with only those whose roll numbers are a divisor of his roll number.
Can you help Byang count how many friends he will make?
The input will contain an integer N (N < 1000000).
Print the number of friends Byang will make in his new class.