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- #include <bits/stdc++.h>
- using namespace std;
- long long a[1000001];
- long long b,i,n,k;
- int main()
- {
- while(cin >> k){
- if(k==0) break;
- b++;
- a[b] = k;
- }
- for(i=2; i<=b-1; i++){
- if(a[i]==a[i-1] || a[i]==a[i+1])n++;
- }
- cout<<n;
- return 0;
- }
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