const lines = require('fs')
  .readFileSync('/dev/stdin', 'utf-8')
  .trim().split('\n').values();

const [N, _] = lines.next().value
  .split(' ').map(x => Number(x));

let A = '';

for (let i = 0; i < N; i++) {
  A += lines.next().value;
}

console.log([...A].reduce((a, x) => a + Number(x === 'W'), 0));