#include <stdio.h>
#include <string>
int main(){
    //input
    char S[101];
    scanf("%s",S);
    std::string s(S);

    //count
    int count = 0;
    for (int i = 0;i < s.length();i++){
        if (s[i] == 'm'){
            count++;
        }
    }

    //output
    printf("%d\n",count);
    return 0;
}