#include <iostream>
#include <string>
 
using namespace std;
 
int main() {
    string x;
    cin >> x;  
 
    int position = 0;  
    int min_position = 0, max_position = 0;  
 
    for (int i = 0; i < x.length(); i++) {
        if (x[i] == 'L') {
            position--;  
        } else if (x[i] == 'R') {
            position++; 
        }
 
        if (position < min_position) {
            min_position = position;
        }
        if (position > max_position) {
            max_position = position;
        }
    }
 
    cout << (max_position - min_position + 1) << endl;
 
    return 0;
}
 

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UlJTUlJMUlI=

RRSRRLRR