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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n,a[1005],i,j,count=0;
- cin>>n;
- for(i=1;i<=n;i++)
- cin>>a[i];
- a[0]=0;
- a[n+1]=1001;
- for(i=1;i<=n;i++)
- {
- if(a[i]-a[i-1]==1 && a[i+1]-a[i]==1)
- count++;
- }
- cout<<count<<endl;
- return 0;
- }
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