int main(){
long long int si=0,sf=0,m,f,t,i,n;
char x;
scanf("%lld",&n);
for(n++;n--;){
m=f=t=i=0;
while(x=getchar()-10){
i+=f;
switch(x){
case 35:m=1;break;
case 36:f=1;si=m?si-t:si+t;t=0;break;
default:t=t*10+x-38;
}
}
if(f){
for(;i<10;i++)t*=10;
sf=m?sf-t:sf+t;
}else{
si=m?si-t:si+t;
}
}
m=10000000000;
si+=sf/m;sf%=m;
if(si<0)if(sf>0){si++;sf=m-sf;}
if(si>0)if(sf<0){si--;sf=m+sf;}
printf("%lld.%010lld",si,sf);
return 0;
}