int main()
{
    int i = 2;
    int j;
    int sign;
    int num=0;
    while(i < 101)
    {
        sign = 0;
        j = 2;
        while( j < i )
        {
            if((i % j) == 0)
            {
                sign = 1;
                break;
            }
            j = j + 1;
        }
        if(sign == 0)
        {
            putint(i);
            num = num + 1;
        }
        i = i + 1;
    }
    return num;
}