import java.util.Scanner;
public class Main
{   
	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 min = a;
        if(min>b) {
        	min=b;
        }if(min>c) {
        	min=c;
        }
        if(min>d) {
        	min=d;
        }
        System.out.println(min);
    
    }
}
/**************************************************************
	Problem: 1708
	User: admin
	Language: Java
	Result: Accepted
	Time:790 ms
	Memory:39860 kb
****************************************************************/