#include<string.h>
#include<ctype.h>
#include<unistd.h>
#include<stdlib.h>
#include<iostream>
using namespace std;

int main(){
	double cnum, sum=0;
	while(true){
		cin >> cnum;
		if(cin.eof())
			break;
		sum += cnum;
	}
	cout << sum << endl;
	return 0;
}