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

#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

#define mygc(c) (c)=getchar_unlocked()
#define mypc(c) putchar_unlocked(c)

#define ll long long
#define ull unsigned ll

void reader(int *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(ll *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
int reader(char c[]){int i,s=0;for(;;){mygc(i);if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF) break;}c[s++]=i;for(;;){mygc(i);if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF) break;c[s++]=i;}c[s]='\0';return s;}
template <class T, class S> void reader(T *x, S *y){reader(x);reader(y);}
template <class T, class S, class U> void reader(T *x, S *y, U *z){reader(x);reader(y);reader(z);}
template <class T, class S, class U, class V> void reader(T *x, S *y, U *z, V *w){reader(x);reader(y);reader(z);reader(w);}

void writer(int x, char c){int s=0,m=0;char f[10];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(ll x, char c){int s=0,m=0;char f[20];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(const char c[]){int i;for(i=0;c[i]!='\0';i++)mypc(c[i]);}
void writer(const char x[], char c){int i;for(i=0;x[i]!='\0';i++)mypc(x[i]);mypc(c);}
template<class T> void writerLn(T x){writer(x,'\n');}
template<class T, class S> void writerLn(T x, S y){writer(x,' ');writer(y,'\n');}
template<class T, class S, class U> void writerLn(T x, S y, U z){writer(x,' ');writer(y,' ');writer(z,'\n');}
template<class T> void writerArr(T x[], int n){int i;if(!n){mypc('\n');return;}rep(i,n-1)writer(x[i],' ');writer(x[n-1],'\n');}

char res[10000];
int N;
int len; int in[1000]; char buf[1000];
string str;

int main(){
  int i, j, k;
  int fg;

  reader(&N);
  while(N--){
    len = reader(buf);
    reverse(buf,buf+len);
    str = buf;
    rep(i,str.size()) if(str[i]=='.') break;
    if(i==str.size()) str = "." + str;
    for(;;){
      rep(i,str.size()) if(str[i]=='.') break;
      if(i==10) break;
      str = "0" + str;
    }

    fg = 1;
    if(str[str.size()-1]=='-'){
      fg = -1;
      str = str.substr(0, str.size()-1);
    }

    str = str.substr(0,10) + str.substr(11);
    rep(i,str.size()) in[i] += fg * (str[i]-'0');
  }

  rep(i,777) in[i+1] += in[i] / 10, in[i] %= 10;
  for(i=888;i>=0;i--) if(in[i]) break;
  if(in[i]<0){
    mypc('-');
    rep(i,1000) in[i] *= -1;
  }
  rep(i,999){
    in[i+1] += in[i]/10, in[i] %= 10;
    if(in[i] < 0) in[i] += 10, in[i+1]--;
  }

  fg = 0;
  for(i=888;i>=0;i--){
    if(in[i] || i==10) fg = 1;
    if(fg){
      mypc(in[i]+'0');
    }
    if(i==10) mypc('.');
  }

  return 0;
}