var k,n,i,s:integer; begin readln(k,n); for i:=0 to n do s:=s+k+i; writeln(s) end.
var k,n,i,s:integer; begin readln(k,n); for i:=0 to n do s:=s+k+i; writeln(s/(n+1)) end.
var r,n,i,p:integer; begin readln(r,n); p:=1; for i:=0 to r do p:=p*(n+i); writeln(p) end.
var r,i,p,x:integer; begin readln(r); x:=1; for i:=1 to r do begin x:=x*i; p:=p+x; end; writeln(p) end.
var r,i,p,x:integer; begin readln(r); p:=1; for i:=1 to r do begin x:=x+i; p:=p*x; end; writeln(p) end.
var m,n,t,i:integer; begin readln(t); writeln('N':3,'M':5); for i:=1 to (t div 2) do begin n:=i*2; m:=sqr(n)-n; writeln(n:3,m:5); end; end.
var y,m,n,i:integer; x:real; begin readln(n,m); writeln('Y':3,'X':10); for i:=1 to m do begin y:=n*i; x:=sqr(y)*(sqr(y)-y)/y; writeln(y:3,x:10); end; end.