#include <iostream>
#include <string>
#include <string.h>
#include <vector>
using namespace std;
int GetData(vector<string> &dataList,char *line,char *deli)
{
	//注意：lineは壊れる
	char Line[4096];
	strcpy(Line,line);
	char* token = strtok(Line, deli);
	while (token != NULL) {
		dataList.push_back(token);
		token = strtok(NULL, deli);
	}

	return 0;
}
int main(int argc, char* argv[])
{
	char S[4096];
	fgets(S,4096,stdin);
	vector<string> dataList;
	GetData(dataList,S,"*+");
	char OP[4096];
	int opNum=0;
	int i,j=0;
	int strLen=strlen(S);
	for (i=0;i<strLen;i++){
		if (S[i]=='*' || S[i]=='+'){
			OP[j++]=S[i];
		}
	}
	opNum=j;
	j=0;
	int data=atol(dataList[0].c_str());
	for (i=1;i<dataList.size();i++){
		int data1=atol(dataList[i].c_str());
		switch(OP[j++]){
			case '*':
				data=data+data1;
				break;
			case '+':
				data=data*data1;
				break;
		}
	}
	cout<<data<<endl;
	return 0;
}