#include<stdio.h>
int main(){
	int x,y;
	printf("x=");
	scanf("%d",&x);
	if(x<1){
		printf("y=x\n");
		printf("y=%d"); 
	}
	else if(1<=x<10){
		printf("y=2*x-1\n");
		printf("y=%d",y);
	}
	else if(x>=10){
		printf("y=3*x-11\n");
		printf("y=%d",y);
	}
	return 0;
}