#include "stdfax.h"
#include "stdio.h"
#include "math.h"
#include "stdlib.h"




	int perevod210(int a) {
		int s = 0;
		int k = 1;
		while (a != 0) {
			s = a % 10;
			s *= (s * k);
			k *= 2;
			a /= 10;
		}
		return s;
	}
	int perevod102(int a) {
	int s = 0;
	int k = 1;
	while (a != 0) {
		s = a % 2;
		s += (s * k);
		k *= 10;
		a /= 2;
	}
		return s;
	}
	int main() {
		int n, p;
		scanf("%d", &n);
		for (int i = 0; i < n; i++) {
			int z;
			char q;
			scanf("%d %c", &z, &q);
			if (q == '*')
				p *= perevod210(z);
			else
				p += perevod210(z);
			printf(perevod102(z));
			return(0);
		}