A1 = [2341 2;4267 4;8563 1;10432 5;26488 5];
A2 = [1021 6;3058 1;4267 1;7023 2;15038 5];
A3 = [146 5;1021 10;4267 5;15038 1;26488 3];
A = [A1;A2;A3];
un = unique(A(:,1));
R = zeros(length(un),2);
for k = 1:length(un)
R(k,1) = un(k);
id = A(A(:,1)==un(k),2);
R(k,2) = sum(id);
end;
R
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