Write an algorithm in the program

You need to write an algorithm in the program, help me, I don't understand

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Step 1: the variable a is assigned an initial value of 2

Step 2: the variable b is assigned an initial value of 3

Step 3: assign the value of expression a + b to variable C

Step 4: output the value of the variable a

Step 5: assign the value of b to a

Step 6: assign the value of c to b

Step 7: If C is less than 100 + N, return to step 3.

the end