#include <bits/stdc++.h>
using namespace std;
#define ll long long
int const N=2e5+5;
int const mod=1e9+7;
int main(){
int n;
cin>>n;
int q;
cin>>q;
bool ah=1;
int ans=0;
while(q--){
int x;
cin>>x;
if(x>0){
if(ah==0)
ans++;
else
ah=0;
}
else{
if(ah==0)
ah=1;
}
}
cout<<ans<<endl;
return 0;
}
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