#include <stdio.h>
#include <stdlib.h>

main()
{
    int i, j, k, n;
    double **a, *b;

    printf( "元の数=" );
    scanf( "%d", &n);

    /* メモリ確保 */
    a = (double**)malloc(n*sizeof(double*));
    b = (double*)malloc(n*sizeof(double));
    for( i = 0; i < n; i++ ){
        a[i] = (double*)malloc(n*sizeof(double));
    }

    /* 連立方程式の入力 */
    for( i = 0; i < n; i++ ){
        for( j = 0; j < n; j++ ){
            scanf( "%lf", &a[i][j] );
        }
    }
    for( i = 0; i < n; i++ ){
        scanf( "%lf", &b[i] );
    }

    /* 前進消去 */
    for( i = 0; i < n; i++ ){
        for( j = i+1; j < n; j++ ){
            a[j][i] /= a[i][i];
            for( k = i+1; k < n; k++ ){
                a[j][k] -= a[i][k] * a[j][i];
            }
            b[j] -= b[i] * a[j][i];
        }
    }

    /* 後退代入 */
    for( i = n-1; i >= 0; i-- ){
        for( j = i+1; j<n; j++ ){
            b[i] -= a[i][j] * b[j];
        }
        b[i] /= a[i][i];
    }    
    
    /* 出力 */
    for( i = 0; i < n; i++ ){
        printf( "解X%2d=%10f\n", i+1, b[i] );
    }
}