module main;

import std;

void chMin(T)(ref T a, in T b)
{
	if (a > b) a = b;
}

void main()
{
	immutable INF = int.max / 3;
	auto V = readln.split.to!(int[]);
	V.sort;
	int ans = INF;
	foreach (A; 1 .. 29) {
		foreach (B; A + 1 .. 30) {
LOOP:
			foreach (C; B + 1 .. 31) {
				int cnt = 0;
				foreach (v; V) {
					auto dp = new int[](31);
					dp[] = INF;
					dp[0] = 0;
					foreach (i; 1 .. v + 1) {
						if (i - A >= 0 && dp[i - A] != INF)
							chMin(dp[i], dp[i - A] + 1);
						if (i - B >= 0 && dp[i - B] != INF)
							chMin(dp[i], dp[i - B] + 1);
						if (i - C >= 0 && dp[i - C] != INF)
							chMin(dp[i], dp[i - C] + 1);
					}
					if (dp[v] == INF) continue LOOP;
					cnt += dp[v];
				}
				chMin(ans, cnt);
			}
		}
	}
	writeln(ans);
}