#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct Intcode {
	int ip;
	int mode[3];
	int mem[1024];
	int in[2];
	int out;
};

static int *p(struct Intcode *m, int i) {
	return (m->mode[i - 1] ? &m->mem[m->ip + i] : &m->mem[m->mem[m->ip + i]]);
}

static void run(struct Intcode *m) {
	while (m->mem[m->ip] != 99) {
		m->mode[0] = m->mem[m->ip] / 100 % 10;
		m->mode[1] = m->mem[m->ip] / 1000 % 10;
		m->mode[2] = m->mem[m->ip] / 10000 % 10;
		switch (m->mem[m->ip] % 100) {
			break; case 1: *p(m, 3) = *p(m, 1) + *p(m, 2); m->ip += 4;
			break; case 2: *p(m, 3) = *p(m, 1) * *p(m, 2); m->ip += 4;
			break; case 3: *p(m, 1) = m->in[0]; m->in[0] = m->in[1]; m->ip += 2;
			break; case 4: m->out = *p(m, 1); m->ip += 2;
			break; case 5: m->ip = (*p(m, 1) ? *p(m, 2) : m->ip + 3);
			break; case 6: m->ip = (*p(m, 1) ? m->ip + 3 : *p(m, 2));
			break; case 7: *p(m, 3) = (*p(m, 1) < *p(m, 2)); m->ip += 4;
			break; case 8: *p(m, 3) = (*p(m, 1) == *p(m, 2)); m->ip += 4;
			break; default: abort();
		}
	}
}

int main(void) {
	int mem[1024] = {0};
	for (int i = 0; EOF != scanf("%d,", &mem[i]); ++i);

	struct Intcode amp[5] = {0};
	int max = 0;
	for (int p = 0; p <= 044444; ++p) {
		int x = p;
		for (int i = 0; i < 5; ++i) {
			amp[i].in[0] = x & 7;
			x >>= 3;
		}
		for (int i = 0; i < 5; ++i) {
			if (amp[i].in[0] > 4) goto skip;
			for (int j = 0; j < 5; ++j) {
				if (i != j && amp[i].in[0] == amp[j].in[0]) goto skip;
			}
		}
		for (int i = 0; i < 5; ++i) {
			amp[i].ip = 0;
			memcpy(amp[i].mem, mem, sizeof(amp[i].mem));
			amp[i].in[1] = (i ? amp[i - 1].out : 0);
			run(&amp[i]);
		}
		if (amp[4].out > max) max = amp[4].out;
skip:;
	}
	printf("%d\n", max);
}