思路:
先看能不能买5瓶,因为送的最多,然后看能不能买3瓶,最后一瓶一瓶地买
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int N = sc.nextInt();
int count = 0;
if(N/50 > 0) {
count += (N/50)*7;
N = N % 50;
}
if(N/30 > 0) {
count += (N/30)*4;
N = N % 30;
}
if(N > 0) {
count += N/10;
}
sc.close();
System.out.println(count);
}
}