#include <stdio.h> #include <stdlib.h> int main() { int i,j,n,c; while(scanf("%d",&n)!=EOF) { long long a1,a2,a3; a1=a2=a3=1; for(i=1;i<=n;i++) { a1=a1*i; } for(j=1;j<=n*2;j++) { a2=a2*j; } for(i=1;i<=(n+1);i++) { a3=a3*i; } c=a2/(a3*a1); printf("%lld\n",c); } return 0; } |
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