M=2 satisfies the condition in the first judgment box, and at this time, a=4, b=5 and m=2, because B2 > A2+M2 is an obtuse triangle, which does not satisfy the condition in the second judgment box, so "No" is executed;

M=3, if the condition in the first judgment box is met, execute Yes. At this time, a=4, b=5, m=3, and b2=a2+m2, so it is a right triangle. If the conditions in the second judgment box are not met, then NO is executed;

M=4, the condition in the first judgment box is met, and Yes is executed. At this time, a=4, b=5, and m=4 is an acute triangle because B2 < A2+M2, the condition in the second judgment box is met, and Yes is executed.

N= 1，m=5。 If the condition in the first judgment box is not satisfied, execute "No" and output n as 1.

So the answer is: 1.