#include<stdio.h>
#include<string.h>
int main(void)
{
    int n;
    if(scanf("%d",&n)!=1)
    return 0;
    int c=getchar();
    while(c!='\n'&&c!=EOF)
    c=getchar();
    if(n<0)
    {
        printf("-1\n");
        return 0;
    }
    char line[256];
    double total=0.0;
    for(int i=0;i<n;i++)
    {
        do
        {
            if(!fgets(line,sizeof(line),stdin))
            return 0;
        }
        while(line[0]=='\n'||line[0]=='\r');
        char name[64];
        int id,type;
        if(scanf(line,"%63s%d%d",name,&id,&type)!=3)
        {
            --i;
            continue;
        }
        do
        {
            if(!gets(line,sizeof(line),stdin))
            return 0;
        }
        while(line[0]=='\n'||line[0]=='\r');
        if(type==1)
        {
            long long salary;
            if(sscanf(line,"%lld",&salary)!=1)
            salary=0;
            total+=(double)salary;
        }
        else if(type==2)
        {
            double rate;
            if(sscanf(line,"%lf",&rate)!=1)
            rate=0.0;
            total+=rate;
        }
        else
        {
            
        }
    }
    printf("%.2f\n",total);
    return 0;
}