#include <iostream>
#include <cstdio>
#include <math.h>
using namespace std;
 
int main() {
	long long base[200],powers[200],len=0,i,j,powsum=0;
	long double lgval[200];
	while(scanf("%lli^%lli,",&base[len],&powers[len])==2)
		len++;
	for(i=0;i<len;i++)
		lgval[i]=powers[i]*log10(base[i]);
	for(i=0;i<len;i++)
		{
			for(j=i+1;j<len;j++)
				{
					if(lgval[j]<lgval[i])
						{
							swap(lgval[i],lgval[j]);
							swap(base[i],base[j]);
							swap(powers[i],powers[j]);
						}
				}
		}
	for(i=0;i<len;i+=2)
		powsum+=powers[i];
	cout<<powsum;
	return 0;
}

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