#include <stdio.h>

int main(void){
	int i,sum=0, mul=0;
	char op = '*';
	char s[110];
	
	scanf("%s", s);
	
	for(i=0;;i++){
		if('0'<= s[i] && s[i] <= '9'){
			mul = mul*10 + (s[i]-'0');
		}else{
			if(op == '*'){
				sum = sum + mul;
			}else{
				sum = sum * mul;
			}
			
			op = s[i];
			mul = 0;
		}
		
		if(s[i] == '\0'){
			break;
		}
	}
	
	
	printf("%d\n", sum);
	return 0;
}