#include<stdio.h>
int main()
{
	char str[102];
	scanf("%s", str);
	int i;
	long long int symbol[102], j, value[102], k;
	j = k = 0;
	value[0] = 0;
	for (i = 0; str[i] != '\0'; i++)
	{
		if ('0' <= str[i] && str[i] <= '9')
		{
			value[k] = 10 * value[k] + str[i] - '0';
		}
		else
		{
			k++;
			value[k] = 0;
			if (str[i] == '*')
				symbol[k] = 0;
			else
				symbol[k] = 1;
			k++;
		}
	}
	long long int ans = value[0];
	for (i = 1; i <= j; i++)
	{
		if (symbol[i - 1] == 0)
			ans += value[i];
		else
			ans *= value[i];
	}
	printf("%lld\n", ans);
	return 0;
}