Problem:
Score : 100 points

Problem Statement

N of us are going on a trip, by train or taxi.

The train will cost each of us A yen (the currency of Japan).

The taxi will cost us a total of B yen.

How much is our minimum total travel expense?

Constraints

All values in input are integers.

1 \leq N \leq 20

1 \leq A \leq 50

1 \leq B \leq 50

Input

Input is given from Standard Input in the following format:

N A B

Output

Print an integer representing the minimum total travel expense.

Sample Input 1

4 2 9

Sample Output 1

8

The train will cost us 4 \times 2 = 8 yen, and the taxi will cost us 9 yen, so the minimum total travel expense is 8 yen.

Sample Input 2

4 2 7

Sample Output 2

7

Sample Input 3

4 2 8

Sample Output 3

8

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main(){
  int l, r;
  int min = 2018, tmp, tmp1;
  int i, j;

  scanf("%d %d",&l ,&r);

  for(i=l;i<r;i++){
    for(j=i+1;j<=r;j++){
      tmp1 = tmp;
      tmp = ((i%2019)*(j%2019))%2019;
      if(tmp > tmp1)
        j += j%2019 - 1;
      if(tmp < min){
        min = tmp;
        if(min == 0){
          printf("%d\n",min);
          return 0;
        }
      }
    }
  }

  printf("%d\n",min);
  return 0;
}