#include<bits/stdc++.h> using namespace std; int main(){ int x,ans=0; for(int i=1;i<=5;i++){ cin>>x; int a,b,c,d; a=x%10; b=x/10%10; c=x/100%10; d=x/1000%10; if(d==b&&a==c+1){ ans++; } } cout<<ans; return 0; }
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