#include<stdio.h>
#include<math.h>
int main(){
	double x;
	FILE* in = fopen("input.dat","r");
	if(in == NULL){fprintf(stderr,"error: could no open file\n"); return 1;}
	FILE* out = fopen("output.dat","w");
	while( fscanf(in,"%lg",&x) != EOF ) fprintf(out,"%lg\n",sin(x));
return 0;}