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private int TheNumOfOffLight()
{
bool []light=new bool[100];
int lightnum = 0;
for (int m = 0; m < 100; m++)
{
light[m]=true;
}
for (int i = 1; i <= 100; i++)
{
for (int j = 0; j < 100; j++)
{
if ((j+1)%i==0)
light[j]=!light[j];
}
}
for (int m = 0; m < 100; m++)
{
if (!light[m]) lightnum++;
}
Console.WriteLine(lightnum.ToString());
return lightnum;
}