#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Yukicoder №49 算数の宿題 ★★
// https://yukicoder.me/problems/no/49
// ***********************
#define PRINCR do{printf("\n");fflush(stdout);}while(0)
#define GETLINE(str) do{char *p;fgets(str,sizeof(str),stdin);p=strchr(str,'\n');if(p)*p='\0';}while(0)
#define REP(a,b) for(int a=0;a<(int)(b);++a)
static char *GETWORD(char* str) {char c;char *cp;cp=&str[0];c=fgetc(stdin);while( c != EOF ){if((c==' ')||( c=='\n')) break;*cp++=c;c=fgetc(stdin);}*cp='\0';return &str[0];}
#define	GETINTS(a,b) {char s[34];int *ap=a;REP(i,b){GETWORD(s);sscanf(s,"%d", ap);ap++;}}
static int GETLINEINT(void) {char s[34];GETLINE(s);return atoi(s);}
static int GETWORDINT(void) {char s[34];GETWORD(s);return atoi(s);}
#define lolong  long long
const long long GETA = (1L << 32);

int main() {
	char	str[200];
	int		len;
	char	backcom;
	int		val = 0;
	int		ans = 0;

	GETLINE(str);
	backcom = '*';
	len = strlen( str );
	REP(i,len+1) {
		if(( str[i] != '+' )&&( str[i] != '*' )&&( str[i] != '\0' )) {
			val *= 10;
			val += str[i] - '0';
		} else {
			if( backcom == '*' ) {
				ans += val;
			} else {
				ans *= val;
			}
			val = 0;
			backcom = str[i];
		}
	}
	printf("%d\n", ans );
	return 0;
}