#include<stdio.h>

int random(int start, int end) {
	return rand() % (end - start) + start;
}
int is_prime(int number) {
	for (int i = 2; i <= number / 2; i++) {
		if (number %i == 0) {
			return 0;
		}
	}
	return 1;
}
int nearest_prime(int number) {
	for (int i = 0; i <= number; i++) {
		if (is_prime(number - i)) {
			return number - i;
		}
	}
	return 0;
}
int next_prime(int number) {
	for (int i = 0; i <= number; i++) {
		if (is_prime(number + i)) {
			return number + i;
		}
	}
	return 0;
}
int main() {


	for (int i = 0; i < 100; ) {
		int r = random(50, 100);
		i++;

		printf("%d + %d - %d\n", r, next_prime(r), nearest_prime(r));
	}
	getchar();
}