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(void){

        printf("旅行に行く人数N(1=<N=<20) 電車の運賃(1=<A=<50) タクシーの運賃(1=<B=<50) を入力してください。\n");

        int num[3];
        scanf("%d %d %d", &num[0], &num[1], &num[2]);

        int na = 1;

        if( 1 <= num[0] <= 20 && 1 <= num[1] <= 50 && 1 <= num[2] <= 50){
            na = num[0] * num[1];
        }else{
            printf("入力した数値が条件範囲を満たしていません。");
        }

        if( na == num[2]){
            printf("どちらの交通機関でも %d 円かかります。\n", num[2] );
        }else if( na > num[2]){
            printf("お得な交通機関は タクシー で %d円かかります。\n", num[2] );
        }else{
            printf("お得な交通機関は 電車 で %d円かかります。\n", na );
        }

        return 0;
    }