a, b, n = gets.split.map(&:to_f)
if n >= b - 1
  puts (a - a / b).floor
else
  puts ((a * n / b).floor - a * (n / b).floor).floor
end

a, b, n = gets.split.map(&:to_f)

a, b, n = map(int, input().split())
if n >= b - 1:
    print(int(a - a / b))
else:
    print(int(a * n / b) - a * int(n / b))

chomp (my ($a, $b, $n) = split / /, <STDIN>);
if ($n >= $b - 1) {
  print int($a - $a / $b), "\n";
} else {
  print (int($a * $n / $b) - $a * int($n / $b)), "\n";
}

import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        Double b = Double.parseDouble(sc.next());
        Double n = Double.parseDouble(sc.next());
        sc.close();
        if (n >= b - 1) {
            System.out.println((int) (a - a / b));
        } else {
            System.out.println((int) (a * n / b) - a * (int) (n / b));
        }
    }
}

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