#include <bits/stdc++.h>
using namespace std;

int main()
{
int i;
int iNum;
int V;
int iFlag;
char S[ 120 ];
char C;

	cin >> S;

	iFlag = 0;
	iNum = 0;
	V = 0;

	i = 0;
	while( ( C = S[ i ] ) != '\0' )
	{
		if( C == '*' )
		{
			if( iFlag == 0 )
				iNum = V;
			else if( iFlag == 1 )
				iNum += V;
			else if( iFlag == 2 )
				iNum *= V;
			
			V = 0;
			iFlag = 1;
		}
		else if( C == '+' )
		{
			if( iFlag == 0 )
				iNum = V;
			else if( iFlag == 1 )
				iNum += V;
			else if( iFlag == 2 )
				iNum *= V;
			
			V = 0;
			iFlag = 2;
		}
		else
		{
			V *= 10;
			V += C - '0';
		}

		i++;
	}

	if( iFlag == 0 )
		iNum = V;
	else if( iFlag == 1 )
		iNum += V;
	else if( iFlag == 2 )
		iNum *= V;

	cout << iNum << endl;

	return 0;
}