We consider the adsorption of mutiblock copolymers made of a regular succession of 2N consecutive sequences of Z monomers of alternating species A and B, respectively. These eventually adsorb at the interface between two immiscible, good but selective solvents for the different species. We consider the various surface regimes that may occur as selectivity and surface concentration are changed. These range from flat to hairpin conformations for large selectivities and small concentrations. These progressively crossover to adsorbed configurations with very polydisperse loop distribution of sizes for intermediate selectivities and large surface concentrations.