#include<stdio.h>
struct square{
    int edge_length;
    int area;
};
int calculate_area(struct Square*s,int edge){
    if(edge <=0){
        return 0;
    }
    s->edge_length=edge;
    s->area=edge*edge;
    return 1;
}
int main(){
    int edge_input;
    struct square s;
    
    scanf("%d", &edge_input);
    
    if(calculate_area(&s, edge_input)){
        printf("%d square meters\n",s.area);
    }else{
        printf("Invalid input\n");
    }
    return 0;
}