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No you are wrong. The aim of the question is to spend the maximum amount of money that is strictly less than the alloted amount while having the most fun. A classical knapsack problem.
The algorithm is as follows assuming u have p parties and n is the maximum amount of money you can spend create a 2D array or vector v. now v(i,j) refers to the maximum fun you can have within the first i parties and with spending exactly j money.
now v[i+1][j]=Max(v[i][j],v[i][j-costof(i+1) party]]+fun in i th party]) . Provided the admission fee in i+1 party is less than n.
Now the answer to the question is the maximum of v[n-1][j] where j varies from 0 to n-1.
For more reference refer here.
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