#include <stdio.h>

#define SIZE 10

int main() {
    int coefs[SIZE];
    int x = 0;
    int input;
    int count = 0;
    int length;
    int result = 0;

    while (count < SIZE && scanf("%d", &input) == 1) {
        coefs[count] = input;
        count++;
    }

    length = count;

    for (int i = 0; i < length; i ++){
	result += coefs[0]*i + coefs[i];
    }

    printf("\nResult: %d\n", result);

    return 0;
}