N = gets.to_i
S = gets

$x = 0

$u, $m, $g = "" * 3

N.times do |i|
  N.times do |j|
    #p i, j
    $u = S[j]
    $m = S[i+j]
    $g = S[2*i+j]
    break if $g.nil?
    #p $u+$m+$g
    $x+=1 if $u+$m+$g == "UMG"
  end
  #break if $g.nil?
end

p $x