#include<iostream>
#include<string>
using namespace std;
int main(){
    int line=1,liner,start=0,paper=1,word,symbol;
    cin>>liner>>symbol>>word;
    for(int i=0;i<word;i++){
            string s;
            cin>>s;
            int a;
            if(start==0) a=s.size();
            else a=s.size()+1;
            if((start+a)<symbol)  start=start+a;
            else {
                 start=0;
                 line++;}
                 }
    if(line%liner==0) cout<<(line/liner);
    else cout<<(line/liner+1);
    system("pause");
    return 0;
}