#include <stdio.h>
#include <stdint.h>

uint16_t satsum(uint16_t x, uint16_t y) {
if (x < y) {
uint16_t t = x;
x = y;
y = t;
}

uint16_t res = x + y;

if (res < x) {
return (x - res - 1 + y );
}

return res;
}

int main() {
uint16_t r = satsum((uint16_t )65515,(uint16_t )10);
printf("%i", (int)r);
return 0;
}