#include <algorithm>
#include <cstdint>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>

int main() {
  std::fstream input("input");
  std::string currentLine = "";
  uint16_t lineCount = 0, lengthOfALine = 0;
  uint64_t password = 0;

  // We are skipping the first line since it only tells us
  // where to start with 'S'
  std::getline(input, currentLine, '\n');
  lengthOfALine = currentLine.length();
  std::vector<bool> beams(lengthOfALine, false);
  beams[currentLine.find('S')] = true;

  // We are counting each split not total amount of beams!!
  while (std::getline(input, currentLine, '\n')) {
    // Ignore useless middle lines
    if (lineCount % 2 == 1) {
      for (int16_t position = 0; position < lengthOfALine; position++) {
        if (currentLine[position] == '^' && beams[position] == true) {
          beams[std::max(position - 1, 0)] = true;
          beams[position] = false;
          beams[std::min(position + 1, static_cast<int>(lengthOfALine))] = true;
          password++;
        }
      }
    }

    lineCount++;
  }

  std::cout << password << std::endl;
}