Main.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;

public class Main {

	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		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;
		int ans = 1;
		while (e != E || s != S || m != M) {
			e++; s++; m++;
			ans++;
			if (e > 15) e = 1;
			if (s > 28) s = 1;
			if (m > 19) m = 1;
		}
		
		bw.write(ans + "\n");
		bw.flush();
		bw.close();
		br.close();
	}
}