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#include<cmath>#include<cstdio>#include<vector>#include<iostream>#include<algorithm>#include<deque>usingnamespacestd;intmain(){/* Enter your code here. Read input from STDIN. Print output to STDOUT */deque<longlongint>arr;intq;cin>>q;while(q--){inttype;cin>>type;if(type==1){longlongintx;cin>>x;arr.push_back(x);}elseif(type==2){arr.pop_front();}else{cout<<arr[0]<<endl;}}return0;}
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