Розбір

Since $n \leq 1 0^{5}$ and each number does not exceed $1 0^{9}$ in absolute value, the sum of the given numbers can be up to approximately $1 0^{14}$ . To compute the result, use the long long type.

Algorithm implementation

Read the input data until the end of the file. Sum up the given numbers.

res = 0;
while(scanf("%lld",&n) == 1)
  res += n;

Print the result.

printf("%lld\n",res);

Java implementation

import java.util.*;

public class Main
{
  public static void main(String[] args)
  {
    Scanner con = new Scanner(System.in);
    long sum = 0;
    while(con.hasNext())
    {
      long val = con.nextLong();
      sum += val;
    }
    System.out.println(sum);
    con.close();
  }
}

Python implementation

import sys

Read the input data until the end of the file. Sum up the given numbers.

sum = 0
for line in sys.stdin:
  for var in line.split():
    sum = sum + int(var)

Print the result.

print(sum)

Python implementation — read from file

sum = 0

with open('d:\\WorkPython\\520.in', 'r') as file:
  for line in file:
    for var in line.split():
      sum += int(var)

print(sum)