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This code is used to calculate PI. PI is an irrational number that can be approximated by an algorithm. This is a method called Mobius series.
The first for statement is to initialize the array f such that f[b] = a/5(where b is the loop variable and a is 10000).
The second for statement is the main loop, with c decreasing from 10000 to 5000. In each loop, by calculating the values of d and e, output the value of e+d/a and assign the value of e to d mod a.
The third for statement evaluates the values of d, f[b], and g in the second for statement. B from c, d + = f [b] a, [b] = d mod - g, f/d = g -, - b, d = b.
The output of this program is the approximate value of PI.