#include <stdio.h>

int R,C;
long long T;
int sy, sx;
int gy, gx;

char board[12][12]; //sentinelを準備する。
double prob_board[12][12];
double prob_tmpboard[12][12];

char tmp[11];
int main(){
	scanf("%d %d %lld",&R,&C,&T);
	
	scanf("%d %d",&sy,&sx);
	scanf("%d %d",&gy,&gx);
	
	for(int y = 1; y <= R; y++){
		scanf("%s",tmp);
		for(int x = 1; x <= C; x++){
			board[x][y] = (tmp[x-1] == '#')? 0:1;
			prob_board[x][y] = 0.0;
		}
	}

	for(int y = 0; y <= R+1; y++){
		board[0][y] = board[R+1][y] = 0;
		prob_board[0][y] = prob_board[R+1][y] = 0.0;
	}
	for(int x = 0; x <= C+1; x++){
		board[x][0] = board[x][C+1] = 0;
		prob_board[x][0] = prob_board[x][C+1] = 0.0;
	}

/*
	for(int y = 1; y <= R; y++){
		for(int x = 1; x <= C; x++){
			printf("%d,", board[x][y]);
		} puts("");
	}
	puts("-");
*/
	for(int x = 1; x <= C; x++){
		for(int y = 1; y <= R ;y++){
			int cnt = 0;
			if(board[x][y]==0) continue;
			if(board[x][y-1] != 0) cnt++;
			if(board[x][y+1] != 0) cnt++;
			if(board[x-1][y] != 0) cnt++;
			if(board[x+1][y] != 0) cnt++;
			board[x][y]=cnt;
		}
	}
/*
	for(int y = 1; y <= R; y++){
		for(int x = 1; x <= C; x++){
			printf("%d,", board[x][y]);
		} puts("");
	}
*/
	prob_board[sx+1][sy+1] = 1.0;
	T = T % 100000;
	for(long long move = 1; move <= T; move++){
		for(int x = 1; x <= C; x++){
			for(int y = 1; y <= R; y++){
				if(board[x][y] != 0){
					prob_tmpboard[x][y] = 0.0;
					if(board[x-1][y]!=0) prob_tmpboard[x][y] += prob_board[x-1][y]/(double)board[x-1][y];	
					if(board[x+1][y]!=0) prob_tmpboard[x][y] += prob_board[x+1][y]/(double)board[x+1][y];	
					if(board[x][y-1]!=0) prob_tmpboard[x][y] += prob_board[x][y-1]/(double)board[x][y-1];	
					if(board[x][y+1]!=0) prob_tmpboard[x][y] += prob_board[x][y+1]/(double)board[x][y+1];	
				}	
			}
		}

//		printf("move=%lld-------------------------------\n",move);

		for(int y = 1; y <= R; y++){
			for(int x = 1; x <= C; x++){
				prob_board[x][y] = prob_tmpboard[x][y];
	//			printf("%.3f ", prob_board[x][y]);
			}
		//	puts("");
		}
	}
	if(board[gx+1][gy+1] != 0){
		printf("%.12f\n",prob_board[gx+1][gy+1]);
	}else{
		if(sx==gx && sy==gy){
			puts("1.0");
		}else{
			puts("0.0");
		}
	}
}