import java.util.Scanner;
class Demo12 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
int b = sc.nextInt();
int c = sc.nextInt();
int d = sc.nextInt();
int abMin = a < b ? a : b;
int cdMin = c < d ? c : d;
int abcdMin = abMin < cdMin ? abMin : cdMin;
System.out.println("最小值为:" + abcdMin);
}
}