Problem:
Score : 400 points

Problem Statement

Given are integers A, B, and N.

Find the maximum possible value of floor(Ax/B) - A × floor(x/B) for a non-negative integer x not greater than N.

Here floor(t) denotes the greatest integer not greater than the real number t.

Constraints

1 ≤ A ≤ 10^{6}

1 ≤ B ≤ 10^{12}

1 ≤ N ≤ 10^{12}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B N

Output

Print the maximum possible value of floor(Ax/B) - A × floor(x/B) for a non-negative integer x not greater than N, as an integer.

Sample Input 1

5 7 4

Sample Output 1

2

When x=3, floor(Ax/B)-A×floor(x/B) = floor(15/7) - 5×floor(3/7) = 2. This is the maximum value possible.

Sample Input 2

11 10 9

Sample Output 2

9

Solution in Python (3.8.2) (judge verdict: Wrong Answer)

import sys
import math
A, B, N = map(int, input().split())

#print(A)
#print(B)
#print(N)

ret = 0
#for i in range(1, N+1):
  #print(i)
  #temp = math.floor(A * i / B) - A * math.floor(i / B)
  #print(temp)
  #if temp > ret:
    #ret = temp

temp = math.floor(A * N / B) - A * math.floor(N / B)
if temp > ret:
  ret = temp

  
print(ret)