هرمش - محرر الكود

var n;
var f = 1;
var s = 0;
var k = 1;

write("Enter n: ");
n = read();

for (var i=1; i<=n; i++)
{
    k++;
    f = f * k;

    if (i % 2 == 1)
    {
        s = s - (i + f);
    }
    else
    {
        s = s + (i + f);
    }
}

write("s = " + s);