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What is claimed is: 1. A film cryotron comprising: a superconductive ground plane; a first superconductive electrode arranged on said ground plane and insulated therefrom; a second superconductive electrode arranged on said ground plane and insulated therefrom; an elongated distributed Josephson junction interconnecting said electrodes; as least the first electrode being shaped as a strip extending along the Josephson junction; a control line extending along the Josephson junction above said first electrode; an input line connected to said second electrode; an input line connected to said first electrode at a portion which is spaced from the points of intersection between said control line and the boundaries of said first electrode and from the ends of said junction by a distance which is greater than the width of said first electrode and the depth of penetration of the magnetic field into said junction, said input line having a width which is less than the width of said first electrode. 2. A film cryotron as claimed in claim 1, further comprising at least one more input line connected to said first electrode, which is similar to said input line connected to said first electtode and placed in parallel with it. 3. A film cryotron as claimed in claim 1, wherein said first electrode has widening portions between the points at which said control intersects the boundaries of said first electrode and the point of connection of said input line to said first electrode the size of said widening portions along said first electrode being not less than the depth of penetration of the magnetic field into said junction and the width of said first electrode. 4. A film cryotron as claimed in claim 2, wherein said first electrode has widening portions between the points at which said control line intersects the boundaries of said first electrode and the point of connection of said input line to said first, the size of said widening portions along said first electrode being not less than the depth of penetration of the magnetic field into said junction and the width of said first electrode.