#include <bits/stdc++.h>
int main() {
	char s[102]; gets(s);
	char* i;
	int sum = strtol(s, &i, 10);
	while (*i!='\0') {
		sum = *i == '*' ? sum + strtol(i + 1, &i, 10)
		                : sum * strtol(i + 1, &i, 10);
	}
	printf("%d\n", sum);
}