#include<stdio.h>
#include<stdlib.h>
 
int main()
{
  long long int t, n, i;
  scanf("%lld", &t);
  while(t--)
  {
    scanf("%lld", &n);
    long long int d, grass=0;
    for(i=1; i<=n; i++)
    {
      scanf("%lld", &d);
      grass+=(d*i);
    }
    grass=abs(grass);
    printf("%lld\n", grass);
  }
  return 0;
} 
 
/*
 
Test1:
 
Input:
5
2 -5 -2 -1 6
 
Output:
16
 
=============================================
Test 2:
 
Input:
12
-51 -22 56 -9 47 -59 99 -61 0 -191 999 -808
 
Output:
1286
 
============================================
Test3:
 
Input:
9
-15 3 -7 24 -19 17 -5 3 -1
 
Output:
71
 
=========================================
Test4:
 
Input:
19
51 -999 474 -14 -21 -764 41 -42 -64 -99 -444 -616 1111 -63 1201 6666 
 
Output:
17464
 
====================================================
Test5:
 
Input:
6
-91555 -45617 75642 -66454 12345 115639
 
Output:
533880
 
===================================================
Test6:
 
Input:
7
9494 1427 -6479 4976 -12465 6654 -3607
 
Output:
40929
*/

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Ngo1CjIgLTUgLTIgLTEgNgoxMgotNTEgLTIyIDU2IC05IDQ3IC01OSA5OSAtNjEgMCAtMTkxIDk5OSAtODA4CjkKLTE1IDMgLTcgMjQgLTE5IDE3IC01IDMgLTEKMTkKNTEgLTk5OSA0NzQgLTE0IC0yMSAtNzY0IDQxIC00MiAtNjQgLTk5IC00NDQgLTYxNiAxMTExIC02MyAxMjAxIDY2NjYgCjYKLTkxNTU1IC00NTYxNyA3NTY0MiAtNjY0NTQgMTIzNDUgMTE1NjM5CjcKOTQ5NCAxNDI3IC02NDc5IDQ5NzYgLTEyNDY1IDY2NTQgLTM2MDc=

6
5
2 -5 -2 -1 6
12
-51 -22 56 -9 47 -59 99 -61 0 -191 999 -808
9
-15 3 -7 24 -19 17 -5 3 -1
19
51 -999 474 -14 -21 -764 41 -42 -64 -99 -444 -616 1111 -63 1201 6666 
6
-91555 -45617 75642 -66454 12345 115639
7
9494 1427 -6479 4976 -12465 6654 -3607