#include <stdio.h>

float F(float, float);

int main(void) {
	printf("%f\r\n", F(10, 10));
	printf("%f\r\n", F(0.5, 10));
	printf("%f\r\n", F(-15, 10));
	// your code goes here
	return 0;
}

float F(float u, float v)
{
	return u > 1 ? u + v : u >= 0 ? u - v : v - u;
}