#include <iostream>
#include <string>
int main()
{
int k=0,N=0,PI=3.14;
float S=0,s=0,y=0;
y= PI/8;
printf("VVEDITE KOL-VO POVTORENIY N/n");
scanf("%i",&N);
printf("/n/n");
for(k=0; k<=(N-1); k++);
{
s=1/((4*k+1)*(4*k+3));
S+=s;
printf("S%i=%.10f\n",k+1,S);
}
printf("S=%.10f\ty=%.10f\n",S,y);
getchar();
return 0;
}
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