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A good Samaritan tried to intervene when four robbers stuck up his pal’s Upper West Side store early Monday — and ended up shot in the foot, cops said.

The 29-year-old do-gooder was inside the Lincoln Convenience smoke shop on Broadway near West 71st Street around 4:20 a.m., keeping his store-employee friend company because the shop had been recently robbed, authorities said.

Suddenly, four men, including at least one who was armed, barged in to rob the store, cops said.

When the victim intervened, one of the suspects shot him in the foot, police said.