#include <cstdio>

#define FOR(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define REV(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define INC(i, n) FOR(i, 0, n)
#define DEC(i, n) REV(i, 0, n)
#define INC1(i, n) FOR(i, 1, (n) + 1)
#define DEC1(i, n) REV(i, 1, (n) + 1)

typedef long long   signed int LL;
typedef long long unsigned int LU;


char s[101];

int main() {
	scanf("%s", s);
	
	int i = 0, d = 0, ans = 0;
	bool flag = true;
	while(true) {
		if(s[i] == '*' || s[i] == '+' || s[i] == '\0') {
			if(flag) { ans += d; }
			else     { ans *= d; }
			d = 0;
			if(s[i] == '*') { flag = true;  }
			if(s[i] == '+') { flag = false; }
			if(s[i] == '\0') { break; }
		} else {
			(d *= 10) += s[i] - '0';
		}
		i++;
	}
	
	printf("%d\n", ans);
	
	return 0;
}