problems with division

[pgomez82]

I have this simple program:

int fb;
int fc;
signed long int Rs;

        while (1)
        {
        fb = 400;
        fc = 2;
        Rs = fb/fc;
        delay (20);
        UDR = 0xf0;
        while (!(UCSRA & (1<<UDRE)));
        UDR = Rs;
        while (!(UCSRA & (1<<UDRE)));
        Rs <<= 8;
        UDR = Rs;
       }

and the port receives:
0xf0
240   136 000
240   200 000
240   136 000
240   200 000
240   200 000
240   200 000

I don´t know why 136 appears all the time. The result should be 200. I write this program because I´m not able to understand whats happening with divisions.

Thank you in advance