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- #include<stdio.h>
- long long int call(long long int n)
- {
- if(n==1)
- return 0;
- if(n==2)
- return 1;
- return (call(n-1)%(1000000007)+call(n-2)%(1000000007))%(1000000007);
- }
- int main()
- {
- long long int n;
- scanf("%lld",&n);
- printf("%lld\n",call(n));
- return 0;
- }
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