#include <stdio.h>
//This program gets three double numbers from the user and 
// declares whether we can have a triangle with these lengths or not.

int main(){

	double a, b, c;
	printf("Three lengths: ");
	scanf("%lf %lf %lf", &a, &b, &c);

	if (a+b<=c || a+c<=b || b+c<=a)
		printf("Triangle is impossible!\n");
	else 
		printf("Triangle is possible!\n");

	return 0;
}