#include <stdio.h>

float sum (float x, float y) ;
float mo(float x, float y);


int main () {
 float x,y,mo_res;
 printf("doste X:"); scanf ("%f", &x);
 printf("doste Y:"); scanf ("%f", &y);
 mo_res=mo(x,y);
 printf("MO=%f", mo_res);
 return 0;
}


float sum (float x, float y) {
 return x+y;
}


float mo(float x, float y)
{
 float sum_res;
 sum_res= sum(x,y);
 printf("%f, telos",sum_res);
 return sum_res/2;

}