백준 1476

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;


public class Main1476 {

	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(br.readLine());
		
		int E = Integer.parseInt(st.nextToken());
		int S = Integer.parseInt(st.nextToken());
		int M = Integer.parseInt(st.nextToken());
		
		int e=1, s=1, m=1;
		
		for(int i=1; ; i++){
			if(e == E && s == S && m == M){
				System.out.println(i);
				break;
			}
			e +=1;
			s +=1;
			m +=1;
			if(e == 16){
				e = 1;
			}
			if(s == 29){
				s = 1;
			}
			if(m == 20){
				m = 1;
			}
		}
		
	}

}