ll@H,@W,a[H][W]{1};string@A[H];rep(i,H)rep(j,W)a[i][j]+=(i&A[i-1][j]!='#'?a[i-1][j]:0)+(j&A[i][j-1]!='#'?a[i][j-1]:0);wt(a[H-1][W-1]);