#includeint main() {int n; float sum=1,x=4,t=-1; scanf("%d",&n); for(;n>1;n--) { sum+=t*(1/x); t*=-1; x+=3; } printf("%.3f",sum); return 0; }
#includeint main() {int n; float sum=1,x=4,t=-1; scanf("%d",&n); for(;n>1;n--) { sum+=t*(1/x); t*=-1; x+=3; } printf("%.3f",sum); return 0; }
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