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- #include <iostream>
- #include <cstdio>
- using namespace std;
- int w1(int n)
- {
- return 2*n;
- }
- int w11(int n)
- {
- if (n==1)
- return 2;
- else
- return w11(n-1)+2;
- }
- int w2(int n)
- {
- return n;
- }
- int w12(int n)
- {
- if (n==1)
- return 1;
- else
- return w12(n-1)+1;
- }
- int w3(int n)
- {
- return 3+(n-1)*4;
- }
- int w13(int n)
- {
- if (n==1)
- return 3;
- else
- return w13(n-1)+4;
- }
- int w4(int n)
- {
- //brak!!!;
- }
- int w14(int n)
- {
- if (n==1)
- return 1;
- else
- return w14(n-1)+n;
- }
- int w5(int n)
- {
- return n*3;
- }
- int w15(int n)
- {
- if (n==1)
- return 1;
- else
- return w15(n-1)+n;
- }
- int main()
- {
- int a;
- cin>>a;
- cout<<w14(a);
- getchar();
- cin.ignore();
- return 0;
- }
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