View Compilation Error

0_0_33278762_25432.cpp:2:10: error: 'n' was not declared in this scope
 int main(n){for(float s;~scanf("%d",&n);printf("%.5f\n",s))for(s=1;n-=2;)s+=s/~n;}
          ^
0_0_33278762_25432.cpp:2:12: error: expected ',' or ';' before '{' token
 int main(n){for(float s;~scanf("%d",&n);printf("%.5f\n",s))for(s=1;n-=2;)s+=s/~n;}
            ^