#include <stdio.h>

int square;
    if(square<0){
        printf("Invalid input")
    }
struct Square {
    int edge_length;
    int area;
};


void computeArea(struct Square *sq) {
    sq->area = sq->edge_length * sq->edge_length;
}

int main() {
    struct Square unit;
    
    printf(" ");
    scanf("%d", &unit.edge_length);

    computeArea(&unit);

    printf("%d square meters", unit.area);

    return 0;
}