import java.io.*;
import java.util.*;
public class Main {
static BufferedReader br;
static BufferedWriter bw;
static StringTokenizer st;
static int e, s, m, E, S, M, cnt;
public static void main(String[] args) throws IOException {
br = new BufferedReader(new InputStreamReader(System.in));
bw = new BufferedWriter(new OutputStreamWriter(System.out));
st = new StringTokenizer(br.readLine(), " ");
e = Integer.parseInt(st.nextToken());
s = Integer.parseInt(st.nextToken());
m = Integer.parseInt(st.nextToken());
cnt = 1;
E = 1;
S = 1;
M = 1;
fun();
System.out.println(cnt);
}
private static void fun() {
if (E == e && S == s && M == m) {
return;
}
cnt++;
E++;
S++;
M++;
if (E == 16) {
E = 1;
}
if (S == 29) {
S = 1;
}
if (M == 20) {
M = 1;
}
fun();
}
}