#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

int main() {
	long long n=0,m=0;
	int i=0,ope=0;
	char s[101];
	scanf("%s",s);
	while (1) {
		for (m=0;isdigit(s[i]);i++) m=m*10+(s[i]-'0');
		switch (ope) {
			case 1:// 足し算
				n+=m;
				break;
			case 2:// 掛け算
				n*=m;
				break;
			default:
				n=m;
				break;
		}
		switch (s[i++]) {
			case '*':// 足し算
				ope=1;
				break;
			case '+':// 掛け算
				ope=2;
				break;
			default:
				printf("%lld",n);
				return 0;
		}
	}
    return 0;
}