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- #include<stdio.h>
- int main()
- {
- int count;
- scanf("%d",&count);
- int sum=1;
- int fibo;
- int i;
- int first=0;
- int second=1;
- for(i=1; i<count; i++)
- {
- fibo=first+second;
- sum=sum+fibo;
- first=second;
- second=fibo;
- }
- printf("%d",sum);
- return 0;
- }
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