?? saratov123.cpp
字號:
/*
Alfonso Alfonso Peterssen
11 - 2 - 2008
Saratov #123 "The sum"
*/
#include <cstdio>
int n, i;
int fib[50];
int main() {
scanf( "%d", &n );
fib[1] = 1;
for ( i = 2; i <= n + 2; i++ )
fib[i] = fib[i - 1] + fib[i - 2];
printf( "%d\n", fib[n + 2] - 1 );
return 0;
}
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