import java.util.Scanner;

public class ghj

{

public static void main(String[] args )

{

Scanner scanner = new Scanner(System.in);

int number = scanner.nextInt();

Scanner nb = new Scanner(System.in);

int a[]=new int [100];

for (int i=1;i<number+1;i++)

{

a[i]=nb.nextInt();

}

int sum=0;

for(int i=0;i<number+1;i++)

{

sum=sum+a[i]*i;

}

System.out.print(sum);

}

}

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/6432363/JAVA.java:2: error: class ghj is public, should be declared in a file named ghj.java
public class ghj
       ^
1 error