import java.util.*;
import java.util.stream.*;
public class Main{
	public static void main(String... args){
		Scanner sc=new Scanner(System.in);
		int l=sc.nextInt();
		int m=sc.nextInt();
		int n=sc.nextInt();
		m+=n/25;
		n%=25;
		l+=m/4;
		m%=4;
		System.out.println(l+m+n);
	}
}